Separating glued fuselage after it has dried

That would be a very difficult proposition. You could drill a hole where the prop goes, shake the part out if you haven't already, then use that hole to reglue the part into place. Just an idea...

That might very well work! Thanks!

you didn't say what kind of glue you used.  There is such a thing as a CA debonder if you used CA. I have used it and it works fine.  Solvent cements sometimes make a bond that isn't super strong and you can sometimes take them apart with sheer force, but it is a risk.  In any case you'll need to redo the seams and paint.

drill that hole the size of some styrene tubing,,,,,,,or the size of the outside piece of a tubing telescope

then, you could just glue your tubing in there after you reglue the exhaust manifold, and your prop would still be a slip fit if that is what you wanted

Rex