I actually just built a working prototype
Very rough, but it actually works spectacularly, with all the go-gears on tap. Downshifting is simple enough, from third just pull backward and you get 2, and then 1st.
From first, you can slam it forward to grab second, and while still holding forward, if you do a half-pull on the trigger, you get 3rd.
Getting back into drive is as simple as holding down the trigger and plopping it in.
edit: I put some washers and loctite on to help secure the new "detents", and I have to say it works surprisingly well. I'm probably gonna make another with a longer tab to prevent shifting into drive/neutral, but the idea is pretty much the same.
Myth: confirmed.
edit 2: I may or may not currently regret buying a ratchet shifter.. oh well, you live and learn.
