If it were me, I'd uncase the movement, press the crystal out, THEN remove the bezel insert. That way you can get an Xacto knife blade under it without trying to twist or torque it up (no risk of breaking it). Then, while I was in there, I'd epoxy the HE valve. Then reassemble everything. Less than an hour of work (less than 10 minutes, with the right tools and if you skip the epoxy) and that way you know everything is done right.
I used a c-clamp with wooden shims before I got a crystal press, as long as you're careful that works fine.