I took an SSV screen (5/8 in/15mm) and made a little boat out of it and filled it up. Then I took another screen and put it on top of the boat, making a little cage. Then I just put the screen cage right into the Evo. It sticks out just a hair but its not a problem with the sleeve on. The load is smaller, but getting it in and out is easy as pie. I got the idea from 2clicker who mentioned he wished that he could have multiple chambers that he could switch in and out on the fly. And, iirc, he and Jambandphan03 have both put stainless steel screens and springs into their Evo with success.
I'm still not quite sure what to do about the heat, but I haven't been to Hobby Lobby to get leather strips yet, either. And I definitely need to look into that rubber thumb pad that 2clicker is using.