Lots of good ideas,But not much room in a model a roadster with stick shift and a bench seat. I used the on that was in the car before and made a bracket to mount it next to the shifter,but it doesn't pull right.
On my 50 chevy truck I used the stock release mechanism; at the rear I have an explorer rear axle that I used 2 of the left side cables adapted to the stock crossbar. The right-side cable is twice as long as I needed.
You've got a bunch more room than I have in my tbucket , yet I have three pedals , a dimmer switch & the shifter & ebrake handle , all floor mounted plus passenger leg & foot room !
Then it sounds like you need to look into getting more leverage, perhaps a leverage bar setup. Here's some good info. https://www.jalopyjournal.com/forum/threads/hot-rod-emergency-brake-set-up-question.1228570/
Junkyard. The E-brake boot may be a boot from an '80s Honda and I made the plate that secures it to the floor. The shifter boot is the factory boot from a TurboCoupe. Made the plate for that too. Just go to PickNPull down there on Commercial st., bring a tape measure, poke around and see what you can find!
https://www.controlcables.com/kit-5...ke-lever-boot-and-ring-assembly-pn-b1000b101/ I used this one right behind my shifter. Nice and small. Gary
I'm mocking mine up in the early '28 spot, not sure what the handle is from but it's old. I'll see if it works, but I think it should.
Car is in storage for the winter , sorry not unwrapping for picture . I'll look & see if there's an old one .
1950 GM car underdash unit. Straight pull, no pivoting arm. Keeps it off the floor and away from the kick panel if foot room is an issue.
This is what I shamelessly copied with changes made for stock cable ends & some minor changes to bracketry
I built a bracket to hold a LoCar e-brake to my T-5 next to the stick. And then I made a hump in the floor to surround the stick and e-brake handles so they sat flush and made a single aluminum plate to finish it. I recessed the boots into the plate so you can't see the leather edges and countered the screws into as well.
Used one from a rusted out '70s Jeep Wagoneer I found in the junkyard on the '38 Ford pickup. Real hot rodders find solutions to all kinds of problems at Pick-a-Part. There is a cheap, simple junkyard solution to most problems like this.