Guys about 20 years ago I had a Star that had a extension tube that was 2x as long as the stock luber. I plugged the vent hole on the luber and had a machinest (sp) cut an adapter that allowed me to screw another Star tube together with the one one the luber. I used a piece of all thread for the lube screw IIRC and it worked great.
I think if a person looked around and found a small air cylinder that had a rod length about twice of the one that Magma sells that it would be possible to do it all with air....Wes