Bike long hard rides at the weekend so your fitness is higher than you need for commuting. e.g. my commute is 23 miles on the flat so on a Sunday I do a 70 mile 7000ft loop. I do about 350-500 miles a week, about 10,000 miles/year.
I been commuting via bike for 24 years.
I decide WHO I WORK FOR and WHERE I LIVE based around cycling. Bike geek :)
These are ALL the ideas, many won't apply to your personal situation, you can't use, but pick which ones you can use.
Under-dress when riding, you need the high output of cycling to stay warm.
Ride slow the last 10mins, as slow as you possibly can do. freewheeling. Under-dressing will mean you're beginning to feel cold when you stop. If you have any flexibility of route, try to be in the last minutes coming downhill or with tailwind to be putting the least effort the last minutes, that might involve over-shooting not taking the shortest route, be creative. Think about who you work for, prefer those at bottom of a hill! Think about where you live, prefer those higher up than where you work! In one job I looked for houses upwind (happened to be to the west) so I was blown into work and had headwind going home.
Talk to your manager about your wish, highlight how the average sick days of regular cyclists is 20% of those who drive in, you pick up less bugs out in the air than in public transport, and mental alertness is higher post exercise and higher through the day due to elevated fitness. Your arrival times will be more consistent due to no road blockages or public transport strikes to impact your arrival time. Highlight your work leaving time is far more flexible, not trying to get out before traffic gets bad. Turn cycling in your management eyes into a good thing - then turn that into tolerance of the ideas below.
Offer, or expain, you are coming into work earlier, if required ask permission to come in early, state the first 20mins you are doing personal stuff, you are "chilling". Then, find stuff personal you can be doing to make this a true statement, moving some chores you'd otherwise do in the evening/weekend.
Keep a fan at work, a powered one at your desk and a battery one you can take into the changing facilities. Be prepared to move desk to make this work.
Arrive as slowed-down and as cool as possible. During riding you will be sweating but its evaporating instantly and you are always dry. You then when you stop moving lose the evaporative effect of moving and the sweat you are making is then accumulating and you begin to get really wet, and will keep sweating til the elevated metabolism of the exercise dissipates. It takes about 10-20mins for my metabolism to warm-up as I begin riding and then about 20mins for it to slow down when I stop, the need to breathe drops instantly, like 2 lung-fulls but heat output drops much slower. In changing facilities strip down as quick as possible after getting off your bike, so think about where you are changing and where you keep your bike relative. Consider moving your bike after you changed and after you've cooled down. Change SLOWLY, putting in the least effort, no rushing. Sometimes using changing facilities in a different office and then biking again to your office might make the bike-changing geography better.
Have an ice-cold drink near your desk, either in a fridge you pass, or you brought with you.
Think about the fact you need to be in a cooling breeze to aid evaporation and yet putting in the least effort. A casual walk will cool you down.
Sit at your desk and put on the powered fan (even better than walking, all the breeze no output), sip the drink. Try to lower your core temperature as quick as possible.
Creative tricks are to get permission to sit in your cycling gear for first 20mins as in general less-insulating than work clothes, if you arrive before normal work time, it might be permitted, then when chilled put in the effort of changing clothes.
Try to have your desk in a secluded spot, a cyclist with a fan is something to be hidden and unheard!
Actual smell off a cyclist in general is LOWER than the average person because your work clothes are put on AT WORK not over an hour earlier and sat in a car sweating. Your elevated fitness means once you've slowed down, you're cooler than others, you'll not get as warm as others walking around.
Also, whilst not mentioned, you'll need 2 lunches! I'm hungry a good hour before others due to the exertion and I need to eat to fuel the return journey.
Bike harder on the way home than into work so your fitness level is well above what you need to get into work.
Hope some of these suggestions are applicable. If not, change your employer!