Has anyone tried or considered using a P07 with a D15B7? I'm daydreaming about trying this and wanting to hear your thoughts. I'd incorporate the EGR and, of course, the wideband O2. Probably also add a "dummy" vtec solonoid to avoid a cel. My daily drive is mostly highway here in Ohio so it's pretty flat. Seems like there would be some FE potential if the engine doesn't melt on me.
Or you can use a chipped P06 and play with the fuel map. I happen to have a chipped P06 that I used with the Del Sol. You can have the P06 with chip burner and chips for $100. SVOBoy did the fine chipping work. He could prolly provide more detail on what you could experiment with.
Thanks for the advice everyone. My ultimate goal would be to go with the Z1 when the current motor goes so any wiring work wouldn't be wasted. I'll probably continue to gather parts for the Z1 conversion and not make any changes to my current set-up for now. The idea still intrigues me and I haven't heard a compelling argument for not doing it.