Hi Richard
Great to here that you are still riding, know very little about starting rollers but seems to be 2 person set up, helped rescue a guy at Donnington race track few years ago got into a terrible muddle trying to start up on his own.
The Steve McFarlane option would be my choice and it would add value to your bike, meet him a few times and what I nice guy, hoping one day he will take on engine rebuilds, but seems to be very busy with the starters.
Regards
Nick