Most anything automotive can be done these days. A better question to ask is _would_ you pay for the conversion

No I don't have a price in mind but I'd bet it would exceed $2,000 and quite possible 3,000 with _used_ parts. DIY, probably 1/2 that.
As far as emissions you'll have to wait for a CA member in the know to reply. But forever is a long time.
HTH!