Thanks for the input guys. I drew something up on what i was thinking of doing. I believe my bcd has the fitting glued on. Since i only have the one bcd, not willing to run the risk of ruining it should it fail.View attachment 183593
The inner threads would screw around the current fitting allowing the o-ring to still be used, and the outer threads would allow the inflator to be attached. The thickness of the adapter would allow it to be hidden. Also, should there be and issue, i can just take the adapter off and use the OE inflator
Looks like a reasonable and fairly simple solution. I like it.
For what it's worth, I've fixed a couple of old BCs by cutting out the inflators and installing new ones. It's remarkably easy to do but almost always ends up looking like a hack job. I think your solution will be a better choice.