Dani,
Hot here too! I have put DS in a 0.5 TOG sleeping bag, with just a light top, and and nappy. When I go to bed, I will re assess and maybe add a blanket.
I used muslin wraps this time last year with James. But I was lucky, by the really hot weather he didnt want to be wrapped any more.
If he wont sleep unwrapped and you are concerned. You could wait till he is asleep then unwrap him???