What a mess!!
Whilst a can’t see any problems with what you propose, other than the minor one of the invoices (paid) for the works being in the name of the individual Proprietors instead of the Owners Corporation (O/C), I don’t think it’s a wise move.
I understand your collective frustration, but your O/C would be well advised to engage its own Lawyer; ideally one experienced in strata matters and building/development such as Makinson & d’Apice who are sponsors of this forum.