I'm totally unexperienced in SSI, and have never laid hands on it. But I'll give a few answers according to my HTML/PHP experience. ^^
Does SSI have a "<script language=" thingymabob? Or some way to access the language from an outside source? If so, I'd try that.
I'd leave the extension as .php, at least I think. =P Some uber person will come and prove me totally wrong in a minute though anyway, meh. I don't think the .php extension is important in PHP. As long as the server understands what it must produce when interpreting the code, I think the .php is there to simply make it more user-friendly.
(I think that is. =P)
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