re arc: you’re not a rav or posek and I certainly am not. But a few things I infer are basic –
There is an inyan to drink.
Kohanim can’t duchen if they drink a certain amount, not necessarily enough to intoxicate. (I’d like a clear answer to that.)
Kohanim duchen before hakafos at shacharis.
Apparently, if kohanim can duchen at shacharis, it is not customary or fitting for drinking to start before hakafos.
And, let’s not forget, anyone who holds a sefer Torah must be in charge of his faculties, at most, very, very minimally buzzed.