That would be the worst thing ever.
My HOF is NOT that stupid.
Yeah, siding with the Architect in Awakening was one thing because everyone knew that was a calculated risk going in.
Still, it seemed like an acceptable risk to me, as having allies in the Deep Roads who can safely venture into places that the Wardens cannot, would be advantageous to allow them to scout out the Roads and keep a check of the horde's movements. Plus, gaining the Architect's knowledge of the Taint and how it can be used to both break the hold the Old Gods have over the 'Spawn and allow Ghouls to retain their sanity, seemed like it could ultimately prove a boon for the Wardens if it could help find a way to cure the Calling (which the HoF is now seeking), This is especially true since the Architect's experiments are essentially the same thing as what Avernus was doing, which allows you to pool both their research.
I never truly trusted the Architect (and given that he's possibly one of the Seven Magisters responsible for this mess, seems it was right not to), but the pros seemed to massively outweight the cons in that situtation. Even in retrospect, they still do, since unless he's playing a long game and will turn on us eventually, he's kept his end of the bargain for over a decade at this point. And if he's able to pull that same resurrecting trick as Corypheus, killing him and turning him against the Wardens might have ended up being even worse a mistake, given his intelligence and vast resourcefulness.
But I digress, having the HoF being in the place of Clarel would have never made any sense, because even if we've already done some questionable decisions along the road already, it doesn't seem in-character for us to go along with the Demon Army thing, especially when this requires sacrificing our own forces in a questionable ritual from an incredibly shady guy who's so obviously not a villain.
I like to think that the HoF is far wiser than Clarel in this regard, since unlike her, they already saw how badly trying to wrangle Demons into service ended when Avernus tried to do the exact same thing at Soldier's Peak, which ended up killing every Warden present and tearing the Veil in that location for over 200 years.