Got back from Mt Rogers area trails (AT, others, in SW Virginia) last night and checked the thread tonight. Thanks to all for good wishes and appreciative comments.
Answers and comments in no particular order . . .
Brent's trowel will go out tomorrow as I just finished making it.
Poup soup is a great Leave No Trace method; please pass it on (not the soup, the method).
If you really want to go light, you can use one of my trowels as a spoon before using for a cathole or after (if first dipped in your boiling water) and it will also work as shoehorn, back scratcher, hide scraper, tick remover, seep/spring deepener, bait cutter, fish scaler, and cheese slicer.
The handle hole: You can use a punch to make a hole, but you take a risk of cracking the handle (titanium is a bit on the brittle side) if you do, and shortening the life of your punch. Hence my decision not to make handle holes. Add at your own risk. I'm told you may be able to drill a hole with a Dremel tool, but I don't have a Dremel tool to test this.
Other handle options: I have ordered material and will test the idea of a rubberized handle coating, which Mr. Regulator put on his trowel and is very happy with the result.
And finally: I am planning to make and test a larger trowel for those who want to dig deeper and faster. Stay tuned.
Have not yet run out of titanium and am looking for more.