Looking at the Weight Handicap idea, aiming to get everyone to 4 Watts/Kg gives an interesting range of weights.

It should make for a fun ride!
I was thinking of stage 5 from the spring sessions, which is basically all uphill, or perhaps something Alpe D'Huez, to avoid the more severe gradients that max out the trainers resistance.
The thing is, the real powerful guys like AAAC, Bridgy, Adam and Bill end up with a weight around 90-100 Kg, which should give them a sense of what it is like for the mountain moose's, and the big guys get to go with weights around 60-70 Kg or even lighter, so they should fly up the hills!
Since everyone will start together and theoretically be able to make the same watts/Kg then most riders should be bunched together the entire ride!
Trying to anticipate the short comings with the handicap principle, I guess at higher gradients, the resistance will max out for the big power guys, and they will be able to go faster than their Handicapped weight would normally allow. Pushing 100 Kg up 20% at 400 watts should definitely overcome the poor bkool trainer's resistance.
However, at low gradients, weight is much less of a factor, so the higher total watts will again give the big power producers an advantage.
To keep things close, I would presume needs a gradient within the bkool's resistance range for anything up to 100 kg, but high enough to make weight and gravity the deciding factor. Say around 8-9%?
I did wonder if multiple laps of the Merry Harriers would do it? A bit dull perhaps?
At 4 watts/kg it should take around 8 minutes each climb, so 4 laps would take 32 minutes?
EDIT: Perhaps 3 laps to keep the time below 30 minutes and avoid mucking with fitness levels?
Geoff