The only one who sees it as fake is Aega himself.
Of the only other two there who know its 'fake', Igarashi herself is all for it, and Galshias has been on team Igarashi from the start so he's going to make sure it turns into the real thing.
And everyone else believes its real and accepts it. Liv too even if she's disappointed (and I'm sure will later jump on any chance to be an additional wife/concubine).

That aside, I'm really hoping Igarashi gets drunk again at the wedding in front of absolutely everyone in the territory. It'll be an absolute riot.

hoping it does

I mean, at this point it's pretty much not any different from being real

Think Tania won't be too happy about it though