I have an idea, and I need someone's opinion on this.

1. Drill a hole in the rounded part of a powerlet
2. Weld a metal tube that extends from end of powerlet to the end of the seal.
3. weld a new double-ended hollow seal to the metal tube.
4. Adapt a connection between an electric air pump, with battery and switch operation.

so it looks like this:

||||||||||||||||||||||||||||||||||=============="===
||||||||||||||||||||||||||||||||||)=[__[o I -]__]
_\|_) [- +]~'


( The metal tube is inside the 1077 )

Whenever the powerlet would spend all of the air, you could flip the
switch and refill it. Does this sound possible? Please give me some
insight of this.

CO2 working pressure is about 900 psi and pre charged airguns that use a scuba tank have a working pressure of 3000 to 4000 psi.  CO2 keeps leveling off to 900 psi as it cools down after each shot weather you have a thimble full or a tank car full.  Air is pumped up to its pressure and drops with each shot.  Precharged guns have a working pressure range where they operate at a fairly steady velocity and some have an internal  regulator to keep pressure level more constant.  The 1077 is not designed for scuba tank pressures.  You would need to redesign the valve to meter a certain amount of air with each shot and a CO2 cartridge would not hold enough air to obtain many shots.  Valve systems for air and CO2 are not the same.   Also you would need a good size pump to get to 900 psi.

But with a regulated pump (compressor) it would work.

I haven't tried this (YET) but I'm sure that I will by
trying regular air soon.

The valve might not be made for it but I am pretty sure that it can
be replaced.

If you could find a good regulator that is used for filling
breathing equipment (like I have got) you could just set
the pressure to 900 psi, and yes it will get less after you
fired some shots but in the end it will be cheaper, although
you would have to fill more.
If so you could just use a normal sized scuba tank/nitro tank.

It's just a matter of using the right equipment and owning the right
equipment.

Let us know how it turns out and I wish you the best.