If you previously held a QLD licence and have been a resident, you should be able to get it back when you're in the country. Good news - you dont have to hand in the UK one!
Ater exchanging my QLD one for UK 12 years ago, I visited Brisbane earlier this year in April ahead of moving back (fly out on Monday! ) and popped into the department of transport and sorted out renewing my licence. This was aided by the fact that my Australian address has not changed since, so they still had all my details.
As long as you have proof of address and proof of residency, you will be able to renew your QLD licence and still keep the UK one. Unfortunately the QLD one only lasts 5 years and it costs way more to renew than the UK one. But you shouldn't have too many problems getting it.