OK, so the actual stat block when getting back from his Demiplane seems to be:
2 HP +30 HP during 16h + 24 temporary HP.
A 8th level spell slot.
A 7th level spell slot.
Two 6th level spell slots.
With DMM, Simulacrum and 6 Galven magens in the open. No mind blank (Wish was used to get back on the Material Plane from the Demiplane) so no twinning sorcery points used, but you could cast Extended Seeming for 1 SP, leaving you with 19. No Death Ward (Wish was used to allow you to get back from the Demiplane) as well.
Note that traveling incurs a CON check after 8 hours. It is therefore, by the rules, more strenuous than the sitting activities described. You can't rest while travelling (though you could say that you could rest on a stationary pegasus, which would be really bending the wording...). And that you had to accept that Simulacra work as RAI, not as RAW, because the alternative was to have Wish work as RAW as well, bypassing any requirement of the spell. And you elected, freely and without pressure, to follow RAI for spell wording, when clarified by the rule designer. [If not, then when we'll get to use Wish, which we might, it will bypass all spell requirements when duplicating a spell effect. Which is silly and as silly as imagining that Simulacra regain other sorts of expandable resources.