Actualy there are more solutions and upgrades possible, if you have the machines available.

More options I see atm:

The buffertank is also a 12 oz bottle, but with another kind of direct connection.

So, by making a second direct screw in connector with liquid stopper and fitting it on the existing buffertank inlet, you carry 2 12oz bottles. But then youll have to move the buffertank, and that can be done with an hydraulic 3/8 bsp hose.

Other thing you can think about, now the 13.6 kg limit is there. The 12 oz buffer has only 2.2 times the volume of the ram. Normaly I advocate 3 times as a minimum. So, a 20 oz buffertank would increase the speed of the flips too.

Best option according to me, is to replace the collector with a wider version, were you fit a 20 oz bottle and 20 oz buffer.