You should be able to load birdshot capsules into your 45 Colt to get you through the .410 squeeze.Yeppers, me too. I've been wanting a Bond Arms derringer chambered for 45 Colt and .410 shotgun for a while now, but I won't buy one until .410 shotgun ammo becomes available again. I can (and will) build the 45 Colt ammo myself, but I've never loaded shotgun ammo of any flavor, and really don't want to get into it if I can avoid it.
I am getting kind of worried about the situation though. We have a .410 shotgun for pests in the garden sitting by the back door, and I'm becoming concerned about how much longer I can feed it.