Wow that's nice looking, and practical, You do good work!
I took the liberty to attach pics for ease and convenience.

The Artemis PP750 is such a neat platform for tinkering. It's like the new generation of 2240, updated for the PCP era. A finely made but still reasonably priced airgun which can go in any number of directions, as demonstrated by a bunch of threads in different forums over the last three years.

Nice work getting your stock to work with your preferred setup. I certainly appreciate the desire for a low scope, especially for close up work, like back yard pesting. My Brocock Atomic and Crosman 2260 are both set up that way, with 4x scopes on the lowest practical mounts. Makes for relatively smaller holdovers inside 15 yards or so. But with my Artemis, I chose a little 3.5x prism scope - a great find on Amazon for $75, shipped. Thing has surprisingly distortion-free and clear glass for such a cheap thing. The mount is tall at 2.36" from centre bore to centre optic. So I'll have to live with 0.75" of holdover at 10 yards, as adjusting for such a close zero would make shots further out challenging with hold-under.

I did this little mod to the stock's aluminum and plastic buttplate. It frustrated me that if I wanted to leave a magazine in the slot, I had to cock the gun. Of course I could de-cock by holding the lever, releasing the trigger, and easing the lever back down... but then I've got a pellet in the chamber, and if I want to take a shot I need to cock again, advancing the magazine, and chambering a second pellet. No good.

So I opted for having a magazine on the airgun, but not mounted for shooting. Instead it's in a recess I drilled and carve from the aluminum and bit of plastic sliding plate below, then filled with JB Weld, using masking tape and a paste wax for release compound on a magazine to form the epoxy. After waiting overnight for curing I eased out the magazine - my blend of beeswax and mineral oil is very slippery, something used for lubricating zippers on musical instrument cases, and threaded adjusters on instrument bows - and trimmed the edges of the opening. Not exactly fine work, but it does the job. I put a neodymium magnet on the magazine before pushing it in, so that's there to retain the mag while carrying the pistol but allows easy removal.

I also got rid of the huge knurled steel knob for adjusting the buttplate. I like the rubber centred and won't be needing to adjust that, so I dug through parts and found a matching bolt with a shallow rounded head and used that to tighten up the plate before all the above carving. The knob was cutting into the anodizing under the ducktail of the grip, left a small scratched area when closing the stock. With a simple bolt the stock closes an extra 1/2", and there's still plenty of room for the stowed magazine.