I could see it if they go the following route:
1) Reinstitute the medical coding that transgenderism is a mental disorder.
2) Determine if anyone is currently diagnosed with such disorder.
3) Enforce appropriate control on the ownership of firearms by the mentally impaired.18USC922 Possession of Firearms by People with Illness
If you haven’t already, watch the 12 min video of a smart pro-2A attorney opining on this very subject.
Ditto