Thanks a lot Dan,
It seems that going the BT route would be the easiest. Not having played around with multiple BT devices connected at the same time before, I was a bit wary of the possibility of it.
Does it matter that the Tab will act as a master and the other devices as slaves or will the communication work both ways?
Sorry for asking the question and not just testing it.. I am currently in the UK and my glider in South Africa- so I'd like to hit the ground running with the set up as soon as I get back!
I'll have a look for possible serial to Bluetooth modules!

Thanks!
Jean