The only thing about the AMB system is that surely, in this circumstance, it's better for all if there is a monopoly in place? You know that pretty much any club you turn up to will run AMB, and your PT will work.
Even the new RC4 transponders aren't that expensive.
I will say though, an MRT system (copy of the AMB one, but will work in conjunction) would be the best bet - still supports everyones AMB PTs, but also new MRT transponders - perhaps have an extra digit for the MRT PTs, so there is no clashing to worry about?
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