Making paper briquettes is easy, but you have to wet the paper first.
Make the briquette then store it to let it dry (can take a while).
The gaelscoil is making it, then they’ll donate it to SVP, SVP might sell it. If you buy it from them,they should be cheap enough and it’s a donation to a good cause, + no need to store it until it dries.
Most of the prices I seen were bags of logs for a fiver I think. See if you can find a dodgy looking tree and a chainsaw and get to work 😉 Some farmers might be glad of someone to clear a bit of wood for them.