Bf109G-6 Armament Question

I've pondered this for a while but never found the answer so I was wondering if any helpful souls on here could assist me with this.

The 109G-6 had two different 30mm cannon variants to my understanding, that being the U4 with the nose cannon and the R4 with the underwing cannon pods.

I just wanted to ask if it was ever possible for the G-6 to fly with both of these variants spliced together effectively giving the aircraft 3x 30mm cannons or whether it wouldn't have been feasible until a later model of the 109 was produced.