Some discussion on the TR forum brought an idea, I can see from previous post similar things have been requested, longer climbs etc but not a total Everest climb with extra features.
Starting from Watopia sea level, you move upwards to Watopia base camp. Then through the Khumbu ice falls, Base camp II…III past avalanches, up Lhotse face etc on to ridges and cols and the steps until you reach the top. Plenty of creativity could be had here.
You would have a maximum of 24 hours with limited unscheduled resting periods during your ascent, say 10 minutes of no moving and see how far up the 8848m Everest ascent you get. More rest can be had at official Watopia Base camps of up to 60 minutes.
Zwifters can then have their usernames chiselled into the ice road as a marker/Tag on how far they got… or a prayer flag at the side to show themselves and others how far they climbed. At the top some sort of roll of honour could be chiselled into a Watopia Everest wall.