Has anybody tried it? I emailed Rode but got no response.
Yes. I have used my AT-825 in the Rode Blimp and it worked great for recording outdoor ambience. As I recall it was a bit of a squeeze to snap into the included hoops but the mic did fit. I did remove the short through-handle mono xlr cable as it is useless with the 825. Ideally you'd run a short stereo 5-pin XLR in its place.
I don't know about the 825 but the 4025 will fit nicely and they're almost the same size. GEARSLUTZ THREAD ABOUT IT
4025 even fits into a baby ball gag. among the best tips i've gotten here so far...