THIS WILL NOT BE REJECTED BY THE NETWORK. Wanna know why? Because the blocks are still valid to the network with the 80% foundation backdoor issuing method.
Ok, then when you your fork starts rejecting them it will be a hard fork. At that point honest nodes will start ignoring your branch of the chain.
And again, even if all nodes accepted your hard fork, if you don't change the reward for miners formula it will take many many years to have a fixed supply. We wanted less years than bitcoin even before the 80% fund decision and your fork will take many more than bitcoin.
It's like when IXcoin creator thought he was issuing the 21 M twice as fast when in fact with his original code he was issuing 42 M in the same time. You just don't understand "your own" code.