I think you just described the perfect hikers knife. I have a Gerber LMF II Survival that I love but its not light at 19oz..So if there would be a way to put it on a 18oz diet I would carry it with me everywhere.
The reflective 100% dyneema/spectra guyline cannot be made or so thats what I am told by every cord maker out there that works with Dyneema/Spectra. It has to do with their coating process. They all can make a triptease type cord with a polyester sheath but whats the sense in trying to compete with Kelty. Now if you tell me Triptease is made in China I might look at the idea. Do you know where its made???
The nails stakes have been plagued with setbacks. The only company that would make them using a 7075 T6 required a 1,000 lb order which is something like 45,000 nail stakes. I found another company last week that is going to make me a sample. They still haven't told me a minimum so I am keeping my fingers crossed. I am going to start selling Ti-Stakes on my website again so keep an eye out for those as well.
It looks like the blind cord is working good for your application. Blind cord is usually a solid braid and is made from nylon or polyester. Its essentially the same thing as a shoe string. I am not sure of weight ratings since this isn't apart of the design but I would say its around 50lbs. If its polyester then it has good uv resistance but if its nylon then it has medium uv resistance. On shorter pieces you wouldn't notice it much but an all nylon cord has alot of stretch while a polyester cord has less stretch but it still has some. This can be a problem if your using silnylon or using long pieces.. If you can get the blind cord for free and its working good for you I would suggest continuing to use it. Guywire on the other hand has zero stretch and is weight rated to 975lbs so it works great for tarp ridgelines, bear bagging, whoopie slings, guy lines that cannot freeze and break, and anything else you can think of. Its basically ultralight cord on steroids.