It makes more sense to develop a "Polish bomb" with several other countries cooperating, and share it with the most threatened countries from Finland down to Romania.
It is "just" way more expensive.
The last couple of months have shown that the world is moving back into a multilateral order, in which individual european nations are far too small individually, in which they would be used as pawns on the geopolitical chessboard by nations with far larger economies and populations. i would rather have to discuss the use of defensive materiel with a Frenchman then an American, considering the latter has two oceans between it and any major threats.
There is no European nuclear stockpile, so the first step would have to be making one to safeguard. France has made it clear that its nuclear weapons are France's alone.
I really hope this will finally happen.