JWT ECU question

A friend has a 98 Altima SE and we want to do an FMAX Stage 1 kit on it. FMAX says their kit will only work with the 97 and older Altimas, because of the JWT ECU. In other words it's the same problem SE-R owners have - JWT hasn't cracked the 98+ ECUs, and you can't just bolt a 97 ECU into a 98, it won't work.

So my question is, does anybody have any information on getting an older Altima ECU to work in a 98? On the SE-R side it requires a little rewiring, nothing too major - if anybody has any information on specifically what needs to be done to get an older JWT ECU to work in a 98 Altima, I'd really appreciate it. We don't want to go standalone with the engine management if we can avoid it at all.