vigi-one, Qlink are already using jets on many routes and making a motza. 717's are flying BN-GLA, BN-ROK, BN-MKY. Fokker100s are doing BN-EML, and the list goes on.
As for sending mainline pilots to Qlink to fly the jets, why on earth would a QF captain/FO want to take a huge pay cut to fly a single aisle jet on regional routes? It may apeal to an SO, but i hardly think an SO would be up to the task. Regional flying in the front seat requires a bit more than making coffee for the skipper and radio calls above transition.