Looks great!!
I do like that black/grey color scheme.
When you said conversion to road use I did not know you meant dual sport tires. I envisioned motard style (but 21/18).
I was thinking Shinko 777, 999, 712. A quick search and I see you can get some in 21". Shinko 230 and 777, for instance are available in a 90/90-21". The front tires look skinny without the knobs. The dual purpose tires probably look thicker with those dual purpose tread blocks.
I think the Kenda 761s look way better than road tires on this bike