InoyOleh
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This is NOT what we need; churches are appearing again. The first option is good; there's no need to overthink which hero to use to enter the castle to get the desired upgrade.
Otherwise, I build a Fortress for a tier 1-2 resource boost, and in the window, I choose the basic upgrade I want, even if my hero has a different specialty! That's great – freedom of choice!
Nargott, are you planning to implement this option for the Citadel (tiers 1-4) and the Castle (tiers 1-6), or will the basic upgrade only be selectable once in the Fortress?