I am not convinced. I have tried using blazor and it has been painful at best.

I know of at least one internal tool at Microsoft (Azure) still using razor pages. I don't know how much I am allowed to talk about this but most teams as far as I can tell at Microsoft use react. You should too. This is not a fight worth fighting. For internal applications, stay with asp net razor pages. It doesn't need anything fancy. Don't run after a fad that even teams within Microsoft refuse to chase.