Take the rubbers out.
My Africa Twin didn't have them when I bought it, use road boots all the time. Some folk say they wreck the sole of the boot, but I haven't had any issues in six years, but I do find it gives you good grip when standing on the pegs.
I do , however , insert the rubber bits when travelling long distances, saves vibration through the pegs.
Hope this helps.
Oh and looking good in the fog