Integer multiplication and division is possible with Midihub as is right now, division is easy - just use Tempo Divider pipe.
For multiplying the clock - you may make a few copies of the incoming Clock stream. This won’t space the Clock messages out evenly though, some Transform and synced Delay trickery would be necessary, and it wouldn’t be easy to control, but it should be possible to set up a nice ‘fixed’ multiply clock by integer X times.
Do you think you’d need to change the multiplication factor often?