One small concern: Would we able to enable the Quiz extension in case of such a move? It is one of the distinctive features of VW.
Hello Vito,
thanks for raising this concern.
Although I am not sysadmin of WMF wikis, so I can't guarantee this answer, I strongly believe that there won't be any issue with that considering that the extension doesn't change (or rather: interfere with) any existing setup as well as Incubator has other project specific extension installed - GeoCrumbs (formerly known as BreadCrumbs) because of Wikivoyage.
And as one of the Incubator admins and bureaucrats, I don't have any problem with having such extension installed there.
Are you aware of any other specific extensions installed on Beta or any other Wikiversity?