If you can pull it off without an additional bezel and curve it to the shell that would look awesome. You’re making me seriously consider cutting off my roof bezel. I’ve attached the bezel but haven’t cut the opening for the fan yet. I’m still undecided if the fan is the right choice.
I’ve worked with acrylic a fair amount and it is easy enough to heat and form. The anodized aluminum frame may be difficult and it will certainly need to be stripped and repainted after all the reshaping work. I’d check the manufacture on what type of aluminum they use, if its the wrong type it could fracture as soon as you start to stress it much.
You could scrap the aluminum and tackle it the same way CLC does the doors by making a sill out of wood.
Please keep us posted on this, and Good Luck!