Likewise, function names are ideal to refactor -- many IDEs will automate this for you.
I don't know your situation, but this sounds to me more like framework envy (and I base this on experience... I've worked with projects on a lot of crappy and/or homegrown frameworks before). If you haven't actually done any major projects in the newer framework yet, that's a bad sign as well, I'm afraid. :)
On a more positive note -- it might be possible to incrementally move to a new framework. It's harder if you want to switch languages/environments completely, but if not, it's probably quite feasible (switch over a feature at a time). If both frameworks can access the same session storage... that's likely the main tricky aspect.