I'm not sure I follow everything you are saying, but if you mean that CF "assembles" the files as they are being processed, PHP can also do that. And PHP can do substitution of special tags with dynamically supplied data. In PHP, we call this "templating".
With a little work, it should be possible to get almost a perfect mapping, tag-for-tag, between Coldfusion's methods and a good PHP templating library. This would allow for your existing files to keep the same structure (with only small syntax changes), and just substitute the core logic with PHP.
I honestly don't have time to help, though. Maybe some others would, using my advice above.
However, if you are really in the crunch you say you are, why not just find a hosting company that supports ColdFusion, and be done with it? Why make trouble for yourself? -------------------------------------------
"Calculus is just the meaningless manipulation of higher symbols"
-unknown F student