Sorry for being slow on the uptake here. Wayne, Dad reached out to a manufacturer of the tie inserter you have pictured and was turned down instantly. Dad asked the guy if it could be or how difficult it would be to modify to 2' gauge. The guy immediately said that it would put to much pressure on the track and would not work. After trying to tell the guy what we planned to do with it, Dad finally gave up.
Nothing saying we can't find one on our own and modify it though.