Yeah, I’d make it one set. Perhaps do it like the War Master, where it ties in with a TV story. If it’s popular and Big Finish are encouraged to do more, then go for it.
I think there’s better potential to do one Beevers set and then maybe look into doing the same for other incarnations, though. That’s what I thought BF we’re doing, with the release of the War Master and rumours of a Missy set, then they announced further War Master sets and cited Missy as Volume 1. No complaints from me, however!
Something worth considering, 2021 is not only the 50th Anniversary of the Master, but also 40 years since Geoffrey took the role in 'Keeper of Traken' and 20 years since he returned to the role in 'Dust Breeding'. I'd really be surprised if he doesn't get his own special set for that at least. And well deserved it would be
It's a tough one. I think the first set would determine if there really is enough demand for a full series. So I say, just have fun with the concept, don't worry about sequels at this stage. I'm pretty sure they considered this with the War Master set, considering how it ended.
One question though, if we have a War Master series and a Missy series, what would they call this one?