Hondata A2 ECU on Z1 harness: Can you?

What I have:

K20Z1 engine, harness, transmission.
K20A2 (apparently) Hondata ECU.
1977 Fiat X1/9.

Hondata, in their usual style, essentially just told me to go jump in a lake. The tech guy said that the adapter harness to adapt an A2 KPRO to a Z1 harness is only good IN a 2005-6 RSX. He had no tangible explanation as to why this is so. He just did a Pontius Pilate: "we don't support that. You're on your own."

Because I already know that the Z1 A, B and E connectors plug in to the A2 ECU, it *could* be as simple as re-pinning the Z1 harness to A2 spec. I am already aware of the high-frequency v. low frequency speed sensors and am willing to take the chance since the high frequency sensor will merely send a higher-than-correct signal to the A2 ECU. I wouldn't *think* this would affect VTEC as long as the computer doesn't ask questions like "why am I going 500 miles per hour?"

Questions:

1) Has anybody used a Z1 harness with an A2 KPRO by repinning the Z1 harness?

2) Can anybody call BS on Hondata for saying that the adapter harness won't solve the problem outside of an actual 2005-6 RSX car?

3) Does anybody have experience to advise me on what I should do OTHER THAN "buy a 2002-4 harness and transmission?"