Hey Mychaela, as Neels pointed out, it's not only up to Osmocom.
None of us have any idea what might be the requirements to enter Germany
by the time April comes around.
Please, let's not go any deeper into arguing covid or health/medical
procedures on THIS list, AFAIK there's not a lot of
virologists/epidemiologists/etc or even health practitioners
(alternative or otherwise) on here.
Best wishes,
Keith.