It is an issue of some question. I don’t think your opinion is unworthy or without merit.
But my guiding principle is to find a route that does the least violence to Church Law and teaching.
What aligns most easily to current Church law would be that the issue wou ld be the matter to be resolved by a Conclave. After all, if a pope is a de facto heretic, even if he cannot easily be judged a de jure heretic, then there is no pope. And a Conclave of Cardinals is to be convened. If the Conclave meets, providing a de jure recognition of the de facto heresy of the automatically-deposed pontiff would be the smallest stretch of Church Law. Then the Conclave could proceed as usual and elect a new pope.
Asking the bishops to act would certainly exceed current Church Law. If the pope is, de facto, a heretic, then there is no pope. And the bishops are empowered by Church Law only to carry out the ministerial tasks appropriate to their pastoral role, either within their own dioceses for diocesan bishops, or within their curial or other administrative roles, as assigned..
I guess I keep going back to what a Vatican I Cardinal said would happen.