Clamp on types are an accident waiting to happen. Look at the brackets on a Honda CB900, RZ350, or RD350LC for the general idea. I used RZ500 peg brackets on an RD400 with a couple of simple brackets to bolt them to. Make or adapt a simple plate to bolt onto teh frame that provides the mount for both pairs of pegs.
or
Or CB1100R
or RZ500
or
Or CB1100R
or RZ500