My feeling is that the Skylark is a classic and as such should be built and flown as originally intended. The Skylark is fairly rare these days and it's usually nice to see a original classic, flimsey wings and all. I also don't think the nose of the fuselage is wide enough to install the Rossi. If you made all the necessary changes there wouldn't be much of the original left.
There are lots of planes out there which will handle the Rossi easily and are still considered old timers. The Sig Cougar comes to mind.
Each to his own though.
Peter