Seven Democrats promised very publicly that they would not filibuster except under "extraordinary circumstances". Being a qualified, scandal-free conservative judge does not count as "extraordinary circumstances".
So no, the Democrats could not sustain a filibuster.
That was part of the genius of the "Gang of Fourteen" deal.
As I understand it, the Dems get to define what qualifies as "extraordinary circumstances," not you, not I, not FR --not even John McCain. Don't recall whether they've said it explicity, but I'll bet an anti-Roe record counts as "extraordinary."