If you’re already doing a starter, why not buy 2 beers and drink them instead? Just pour in the yeast at the bottom of the bottle. Obviously drink from a glass and sanitize the rim of the bottle. But I’d rather buy beer than yeast.
I’ve never tried that, but I’m willing. Another small batch brew in the offing is a spontaneously fermented Belgian. That will likely be a few gallons at most just to see what the local flora us like. Love the Belgians!