Maybe play around? You've enough for about 10 gallons there, plenty to try a few different recipes. I'd done plums with natural yeast before and they came out really well, very long ferment and not particularly strong but a really broad range of flavors. Champagne or cider yeast is usually used, I'm fermenting one with what's labeled as a fruity red wine yeast at the mo and that's turning out interesting, it had a port like taste a few weeks ago but not sure if it'll turn out well as it's turning into an almost burned taste after adding more sugar. That was using frozen plumbs though, haven't used frozen before and it might be very different to fresh.