I would advice against the dual disc setup. It's not a motorbike.
In the mtbing world, we tend to go more pistons & larger discs (not dual front discs).
It's just how it is. There are reasons for that. Namely, that the front axle is only so long, which means fitting an extra disc will make the spokes even closer together, thus building a wheel that will not be as rigid.
Besides, you said it was for street only?
You'll just be throwing money at the project, and quite frankly, not having a frame with inbuilt (rear) disc tabs is a setback.
Just because you can doesn't mean you should.