Yes, for tapered steerers. I think if I didn't already have it, I would go with a tapered head tube. I just hate the fosters can look.

I have had the idea of thinning the Paragon, but I'm afraid of distortion and it's a lot of $ for a tube.

I'm sure the bike shop would let me use their reamer. The main thing is not to ever go backwards, no matter how tempting it might be.