I would not say wildshape is new person friendly, or special needs friendly... druid is a very complex class, one of the most complex to play.
but to answer your question; it already has a built in wildshape enhancement, it's called unlocking polymorph and using it on yourself (instead of enemies). polymorph scales to your level (cr) and is already very powerful.

if you're instead looking to make druid simpler, you could just use like base scaling stat blocks you'd have to make.
make a tanky build with lower attack power and fast one with more attack power but frail... and let them pick one extra movement type: climb, swim, fly that gets unlocked at the provided levels listed for forms. maybe disallow tanky and fly combo. Done.