If David Gilmour was miraculously on board from day one, playing with Mason small venues since 2018, how would that look like? The tour itself, when it started in 2018, looked very much like the extension of Pink Floyd's 1968 world tour (17 February to 28 December), where they played their first two studio albums and affiliated singles (with NMSOS, in addition, we have unreleased stuff from that era too). Continuing the same tour exactly 50 years later would've been a spectacular marketing gimmick

Something like this, David Gilmour's live performance of "Remember a Day", is probably the closest illustration of what it all would be like:
p.s.
Again, kudos to Mason for doing this. We should always keep in mind that NMSOS plays pure Pink Floyd, nothing else. It is a shame 2020 is a write-off for concert tours due to the crappy C-19 thing, robbing fans of their chances to hear NMSOS for an entire year (Mason in 76, and he is not getting any younger), and also robbing the band itself for a chance to evolve further, play with the existing material some more, add new stuff, etc.
p.p.s.
I am still hoping that David Gilmour will join NMSOS on stage somewhere, for a number or two
