I would say the easiest way to do it is ......
Red or green PU with the univalve as normal , with the pole closed up leave 8 to 12 inches of pole hose hanging out the bottom , put a male 6mm rectus on that .
Then attach enough pole hose of your choice onto the end of your micro/mini bore to fit your biggest pole with some to spare to give you movement , on the end of that put your female 6mm rectus .
My biggest pole is 10m so i put 15m of pole hose on the end of my microbore , i use single ear crimps for all joins and then a few wraps of insulation tape to smooth things out .