Yes, the superglue did it's work. Didn't have ant thick, so I used 2 layers of thin that worked ok. The first layer was indeed very hard, but so is the resin.
It is an old kit, about 25 years old and back then they used a very hard and brittle resin, the differance between solid resin and solid glue is not so big as it might be with the much softer versions of resin used by, say, Karaya or Eduard these days.
Many thanks for the suggestions, learned a new trick and the basic airframe is almost done. I have also found a reasonable BMW engine from an Eduard kit in the stash that fits and a seat, should be able to complete this kit at some point.