I have a 6ft brake and sometimes I wish it was longer lol. If you have a brake you might as well get a shear.. and if you're going that far a plasma table might be a good idea too!
Sorry.. I have a tool collection problem.
Realistically, if you had a 24" brake you couldn't even bend the 90 on the bottom of your panel. You would be limited to avionics angles and small brackets.
If you need a small brake and budget is tight, just make one out of angle iron and a bullet hinge (https://www.youtube.com/watch?v=eB9ASQBc9V4). I've made one for 30$ in about 2 hours before.
I would also bet the guys at your local sheet metal shop could be bribed with beer..