Not a bad idea. Replacing BELFAST with ILLUSTRIOUS might inject some interest in that area. "OK, let's go to London for the weekend. What shall we do? Go on Belfast? No, we've done that already...".
I'm not sure many of the general public would see it the same.
Actual WW2 ship with 'guns' and stuff or a fairly modern collection of predominately empty hangar spaces and a strip of flat top bent at one end?
If she could be filled with representative of each aircraft types from her service career then it might be a little more interesting but just how many aircraft is that?
Whilst 'learned' individuals might enjoy exploring her (though how much could realistically be kept in bounds on a ship her size?) I sadly can't imagine her having the same 'Boy's Own Stories' draw as HMS Belfast.