Sooz- The Vansco module system as deployed on the Alpine coach is output constrained, i.e. they use up (at least by 2008) all the available outputs but not all available inputs. An alternative is to send the VMM to somebody who has the software & interface to do programming (might have to send both front & rear, the programmer should know) and switch the input signal to another input. On the program I used to make up the PDF on Vansco Schematic & Tech Info (ACA Tech Library
under Chassis & Brakes), Inputs 24-28 are all marked "SPARE" so any of those would work. You would then have to move the input wire/pin from its current position (which is, for that VMM program, Input4 and therefore pin #4 on the 35 pin J1 plug on the upper left side of module; note that not all Input wire positions correspond the LED number, see that PDF doc for the schematics). Note that the programmer will need to read the existing program, determine which Input LED is Brake Switch or maybe called Service Brake, and notify you or your tech which input wire/pin is the existing signal wire and which wire/pin position to move it to, and therefore which LED you should then be seeing when you step on the brake.
I'm guessing based on the large number of folks who have taken a relay off the brake switch and not burned up the Vansco circuit, that a normally wired relay would not have burned out the Vansco circuit, i.e. if only the coil current were associated w/the input, as that is simply a static load energized when the switch is closed (and not very large; standard Bosch relay coils are 86Ω so ~0.2A). Because both the coil and
load are energized off the red wire coming into the relay, the load side could easily have a spike each time the coil electromagnetically closed/opened the load contacts (arcing across the load contacts when making/breaking contact). Of course its better to follow the Vansco directions to install the diode, & of course it would be easier to follow a normal relay wiring plan and avoid the brain damage of tying to figure out the wacky setup but if I had to guess, I'd say you might have already concluded likewise.