Now that's what I'm talking about! Quite intriguing and yes, this is for a campaign I'm running, not Encounters. I brought up Encounters only because this season does not allow the PCs to take Short Rests and I like that limitation quite a bit. I'm going to think this through a bit of course because half of my table are big-time optimizers and this would rock their world.
If your table is a group of "big time optimizers" rather than rocking their world you might just piss them off. A lot of the success of 4e is that players like feeling heroic, powerful and like feeling like that out of the box (wizards lookin at you) as well as 4 years into the game (ahemm, fighters).
Its your game, do what you like, but you might want to make sure your players are on board with this. You seem to want to tamp them down, but if they don't want to try the new system you made (and yes, with those radical changes it is a new system and no longer 4e) it may just be a giant headache to get them to do what you want to try.
In my opinion one of the biggest jobs of a DM is tailoring their game to the players. You want to make the players have fun, be challenged and go outside of their box a little in a way that is also challenging and interesting for you. Going outside of their box a little might be awkward RP characters they have to interact with, or new changes on the rules (including what you are thinking of using) but the goal is make it within reasonable bounds of the what they feel (and you) feel comfortable with.
It's like inviting people over to your house for dinner. If you have a group of people coming over and they ask what you are making and you say "Mexican". Your friends are going to expect a certain range of things. If when they get there they find that you are putting the finishing touches on your falafel they are well within their rights to say "wtf? Why are we having Falafel?" Some of your friends might love it, some may sit there politely and endure it, some may say "**** this" and leave. All of those things are reasonable responses because you promised one thing and delivered another.
TLDR: Make sure your players are on board with what you are doing (or you can reasonably assume they will be from prior knowledge) before you invite them to a game that is drastically different from 4e.