In reply to I'd rather be climbing:
The other thing you might like to try is to offer to help on an attempt:
a) it gives you an idea of the typical pace for a round.
b) you get brownie points in the bank for your own attempt when you are looking for pacers/helpers yourself.
However be realistic about your abilities - you won't be popular if you can't keep up or get lost/injured and hinder the attempt. Knowing how to get off the tops at any particular point is worthwhile, that sort of thing.