It strikes me that the "transition" modifications being suggested are increasingly closer to existing designs. A Falcon or a Stick (changing the foil) would do the trick or even better a 4*. Semi-symmetric, light, fast frame up yet still easy to fly but aerobatic if wanted.
A really interesting wing planform and airfoil for the desired craft is that of the Side Pocket. I think this last design would fit the bill on all fronts yielding a model with classic pattern looks.
Naturally, they don't look or fly like a Tipo but they are "slow pattern" craft. I feel that getting a Tipo to fly like a Kadet, or vice versa, is somewhat counterproductive. Akin to getting a Spitfire or Mustang to fly like a Texan... Those planes were purpose designed as are the models. Seeing a Tipo fly like a Kadet would be most displeasing. A seasoned pilot would look at it and say something's wrong.
Yes, the more I think about it the more the Side Pocket sounds like the way to go - very clever wing along with a "slow stab".
David