. We can set the complexity of the first round in such a way that it can be with minor electricity consumption.
TBH, you lost me here.
There is always the possibility that two blocks will be found by the same miner. How would you handle this?
Assuming you perfected the above issue, I would say that you should not reinvent the wheel. If however, you feel very strongly about your proposal, I would encourage you to create an altcoin with your proposal implemented. If it is superior to the status quo, the market will reflect your altcoin accordingly.