I don't think the Ogham Brew lads have a problem if you want to bring bottles instead - that's what myself and grainne are planning to do (mostly because we can't seem to get our kegged beers to carbonate properly!). I think you'd just need to be prepared to play barman a bit more in terms of pouring taster measures for folks, rather than letting them hop off a keg themselves...and to not necessarily get your bottles back at the end of the night.