Ok, well, the model-shop raid was a success!!
(turns out, we buy super-77 by the case. there was a half-can of "90" left; the model shop guys told me that they prefer the 77, but anyway...)
So, it seems to have worked nicely. It didn't soak in at all; just worked exactly as advertised.
So now I need to cut down one of the finished doors by a couple of inches. I'm thinking a jig saw with a fine-toothed blade would be the thing...masking tape on the laminate side, to deter any chipping. sound good?