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Update!

Brake fluid turns resin into this rubbery wreck that falls apart. Maybe if I didn't leave it for like a week, but it's risky. Especially with the softer finecast-esque resin, as Forgeworld seems to use two different types.

Easy Off seems to have done nothing, but I haven't left it in as long as the others, since I couldn't find it for a while; still testing.

Super Clean seems to have done the job...well enough. Not perfectly. The bit I glued on fell off while I was getting the piece out of the jar, but the glue is still on the surface of the piece.

Dunking the actual pieces in Super Clean and seeing where it gets me.

If you leave it for 10 minutes, it still softens resin.

Brake Fluid should NOT be used on resin products of any kind.

I learned this after destroying some resin bases accidentally. It took the paint off the metal and plastic figures fine, though. Find another paint stripper for resin.

Update! (again)
Resolved!

Super Clean (purple bottle) seems to be the correct answer.

I left the pieces in Super Clean for one Stalker and Easy Off for the other, for weeks (maybe even a couple months, I kind of lost track).
The Super Clean ones eventually broke the bonds, but it did take a long time.
The Easy Off broke the bonds, but also made the resin all rubbery and flexible. Despair set in. Left the pieces alone for a couple months while I worked on other things. Came back to them and they had formed back up. Heat-gunned a few fins that had become bent and it's good as new. But the situation was still a bit harrowing, so stick to Super Clean and just be patient.
Oh, and know that it will dye the resin a bit purple.