Are electrical subpanels safe in the bedroom?
It should be safe as long as you maintain the required minimum distances to flammable materials and don't obstruct access to the panel. That means you can't cover the panel or have it near any wall hangings, curtains, bedding, etc.

You also must keep access to it, which means it shouldn't be behind furniture or inaccessible for some other reason.

As for moving it, that would be a lot of work. It would require rewiring all the circuits that go to that panel, and also rerunning the cable that runs from the subpanel back to your main service panel.