Line lock options

My favorite was a Dico (might have been Mico)trailer brake. I bought it in the eighties at the OCIR swap meet for $35. Set the brake, it would hold till I kicked the brake pedal. Didn't need to hold the momentary switch.
When it finally died a bit ago, after 35 years, I went to get another. No overhaul kit I could find, a new one was $550.
Okay, something else.
Bought a summit version. I haven't installed it yet, doubt it will last 35 years.
Bought a version from Jegs a few years ago for a different car. Leaked fluid like mad.
For a recommendation? I would suggest the Hurst.
I used to have a mico I think one failed, then had an all manual one on the old Landcruiser. You could set the brakes and move the lever, or move the lever and set the brakes. Obviously not for racing. It was meant for trucks, but for an old 4x4 it worked well. I've been stopped on hills so steep that the engine compression in gear would not hold it, in 4x4/ low range/ low gear. It would sit there a minute or 5 and then "poovvvv" it would roll over 1 cylinder, etc.