1.b3 and 2.Bb2 already comprise the Nimzovich/Larsen opening, so the idea that no such similar setup has ever occurred is wrong. What is also wrong is playing Nc3 -- it blocks both the Bb2 and the c-pawn -- in these non-1.e4-openings, the c-pawn often goes to c4, and only then does Nc3 get played. Considering which (that c4 gets played) it's very uncommon to castle long into a weakened pawn formation.
After 1.b3 and 2.Bb2 typically White plays 3.e3 and then he starts developing his kingside pieces and/or playing c4 as mentioned above. In which case the "weakness" on f2 is immaterial, with the pawn on e3 blocking one diagonal, and a Nf3 blocking both the f-file, and preventing ...Qh4
My advice: stop trying to come up with "new" openings -- it's highly unlikely. If anything you might come up with a new variation on move 5 or 6 or 7 if you're lucky, of an established opening, but no new opening any earlier than that is likely to be any good.
I've been exploring the King's Indian Attack/Benko's opening and was curious about a Queen side variant. From what I've read there is no such thing as a Queen's Indian Attack ever recorded. (If this is incorrect, by all means correct me. I'd be interested in any relevant games to study.). So I decided to see if I could construct an effective one.
So to start I have for white:
So there are 2 immediate issues to address: 1. The fact that f2 is undefended with this opening thus far. 2. What might be the best positioning for the Queen to allow a Queen side castle?
I look forward to anyone's thoughts and analysis!