Dude..you sound like an awful tennis player in your posts..
Fed's forehand is not some 'extreme wrist action' - he just lets the racquet head drop during the first phase of his forward swing - then his natural ISR takes over. Lots and lots of rec players hit this way - albeit not as well..
Here are some juniors hitting forehands - and these guys are from RI. So no - most of those kids aren't going pro..
https://www.youtube.com/watch?v=r4zsif0Hogk
Go to any decent park in the US - especially in CA/TX/Florida - and you will see forehands like this. It's not a big deal - though some of these kids do have a nice forehand.
What's hard about the Hawaiian? You need really good RHS - and when you swing extremely fast you make more mistakes. Whereas some hack with his 3.5 Fedesque strokes just makes clean contact - swings through the ball - and with minimal effort delivers moderate pace..with enough spin to keep the ball in.
You are just looking for some new solution to a non-existent problem. If hitting a decent forehand was some impossible dream - then maybe your approach would be worth checking out. But forehand is one of the strongest shot for men around.. LOTS of rec players hit really nice forehands.
Not that you will take it - but my advice is just to pick a simple ATP forehand (Murray) and copy that.. There is no need to reinvent the wheel. You do not need to be a pro to hit a very nice forehand (thank god)..