Next I will probably try W800RF32A->Elk M1-> Insteon Switch or W800RF32A->PowerHome->Insteon Switch, but I'm not getting my hopes up. Maybe I will wait to see how your experience goes with the ISY and if it works for you I will give it a try.
I would imagine PowerHome would trigger just as well with the W800RF32A.
I am seeing a slight delay with the RF, but it's due to RF and not the translation. Testing with hard buttons on my IR bridge through the powerline is more responsive. Even still, when I'm within decent range RF response from the keychain or palm pad is still pretty good. At the top of my driveway the delay is a bit worse, but still acceptable for my use. I'm just not use to X10 type delays anymore.
A buddy of mine thinks he has some X10 motions kicking around. I may get my hands on them shortly, and can post up some quick results. If they work OK, I'll probably throw a couple in closets to test out.
I'll post up my results.