I heard it is possible to shave down the caliper for it to clear per older hondatech posts. I think you need at least more than a 3mm spacer (recalling from memory when I did a test fit with my friend's RPF1, possibly a 10mm should clear.
To add to the list of wheels that clear, the 15x8 et28 RPF1 clears without an issue.
To add to the list of wheels that clear, the 15x8 et28 RPF1 clears without an issue.