It would take 5-10 years to build the power plants and maybe with Chinese aid even faster
Only a severe energy shortage could motivate politicians enough to temporarily skip these, like they did for the LNG terminals. But you can't build a nuclear power plant of any size within a single legislative period so its just not going to happen.
regarding the "stable energy" point: germany has one of the most (if not _the_ most) stable grids in the world and that is even with 50+ % renewables. And given it sits in the center of europe with grid connections all around, it's far cheaper to buy from whomever has the most favourable weather anyways (and sell to them if they don't). Thats why one of the biggest issues right now is not nuclear, but grids.