I'll throw this one out for someone's future project.

When I built my 58 Chevy several years ago it had been a 3 on the tree car. As usual, I cut the nub and filled the hole. I built the car with TH350 and used a B&M floor shifter (the kind that looks like a 60's 4 speed shifter).

Instead of also cutting the 2 shift levers off flush at the bottom of the column, I only cut one, and left the one that was spring loaded and would cause the shift collar to rotate.

I welded a short lever to the shift arm on the transmission that would connect back to the shift column with one of the factory 3 spd shift rods. When the transmission was shifted with the floor shifter, the shift collar on the column would rotate. The 58's had an automatic trans shift indicator in the dash (which was filled with a blank on stick cars). I built a custom shift indicator panel (it showed PRND21 instead of PRNDGr), and then the transmission shifted the pointer on the collar would show the correct gear on the dash.