One thing that proved extremely helpful to me while having a hand / finger injury that sidelined me for 8 weeks (broken metacarpal) is to consistently load the UNIJURED hand, e.g. with assisted 1-arme FB-hangs.
This prevents strength loss also in the injured (unloaded) hand due to some neurological effects that others may be able to better explain. But most important, it worked for me by doing near max hangs and my pure strength loss after the break was quite (and very surprisingly!) minimal in the injured hand.
What I did loose quite a lot though is stamina (energy reserve) and endurance, but as I think is widely accepted, this can be built up at a quicker rate than strength.
Good luck!