I'd probaly give that a go too. I'm a pretty big fan of fish. For this instance though I have to confess I am cheating somewhat. This is being done for a group of volunteers and the trout will have been frozen. Not perfact I know but my father is a fish farmer (no not a wurzles song!) and I get it for free so I can't complain!
Leo
Ah, I see. Frozen wouldn't be any good, it needs to be straight out of the water really.
You might struggle with pinning the fish out with pegs too, as some others suggested.
The freezing makes the flesh a bit mushy and you may end up with the fish falling apart and into the embers. I may be wrong but, in my experience in fishing, frozen baits don't stay on the hook as well as fresh.
Ramming a stick down it's throat would work, but I'm not keen on that method because I hate picking at a whole fish.
I reckon thawing, filleting, de-boning and using the flat rock method would be best.
Just make sure the rock's good and hot and don't be tempted to flip the fish over, just leave it on its skin side.
I'm not a fan of wrapping it in foil - it tends to get over cooked (you can't see it cooking), the skin doesn't crisp up as nice and it's always swimming around in a big puddle of oil/fat.
I don't really like adding stuff to it either, trout tastes great on its own.
You could always try hot smoking them - improvise with a couple of large biscuit tins and a metal rack of some desciption.