Mixed emotions for me. On one side, that engine in a CRX is already rare. And you'd probably be the only SE owner with that engine. Ultimate rareness! And then on the other side, some people will say you're ruining your SE. But I say do what you want to do. Like you said, you're keeping it forever so it's yours to do what you want with it. Honestly, I say go for it! And log it, take pictures, write details, and post them here. Don't let anyone talk you out of what you want to do.