Question Need advice on attaching pony bottle

[swimmingpooldivein]

Hello!

I just completed the SDI Solo Diver certification, and I'm having trouble deciding how to attach a pony bottle. I dive with a drysuit and Tusa X-Wing BCD. I'm thinking about buying a 3L steel pony bottle. My thinking on options:

1. Mount pony bottle onto primary tank: my setup is already very heavy, so keeping the pony bottle separate is very appealing.
2. Mount pony bottle in front: I do lots of muck diving (getting up close to the silty bottom), so I think this will get in the way.
3. Sidemount pony bottle from shoulder D-ring to D-ring that's under the weight pocket: the D-ring that's under the weight pocket (see picture below) may not work because it's obstructed by the buldging integrated weight pocket. Also, I'm concerned that the pony bottle may accidentally unhook the weight pocket mid-dive and my weight pocket falls out.
4. Sidemount pony bottle from shoulder D-ring to plastic ring that's at the bottom-back of the BCD: this may keep the pony bottle from accidentally unhooking the weight pocket, but I have no idea what the plastic ring at the bottom-back of the BCD (see picture below) can be used for, and how much load it can bear. There's no mention of this plastic ring in the owner's manual.

Any help would be greatly appreciated!!! Thank you!

 

[happy-diver]

3L STEEL ON JACKET BC

2L STEEL WITH DOUBLE HOSE AND HORSECOLLAR

3L STEEL ON JACKET BC

3L STEEL ON STAINLESS PLATE

3L STEEL ON STAINLESS PLATE

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This one I'm actually plagiarising, because you can interchange terms, and learn, it really helps me see
and I do like it