considering i don't go to the field without allen keys(people always need them), i don't need a multi tool for those.....and since i have still yet to adjust my TPC, and have lost my rod years ago..........i don't need that.
the hardline wrench is an ok idea, but like my allen keys.....i have a 6" adjustable wrench that goes to the field with me........ leaving but one tool i need

but...if you wanted to tackle one, let's say you could take a short adjustable, add a flat head screw driver on there somewhere for the TPC (doesn't need to be LONG, people can remove the barrel) and the 2 main allens; 3/8, 5/32. maybe the little one for the thumb screws.

i know it's ugly, and the chaintool isn't needed.......but it might be a start; if the patents could be worked around