If I lived in a place that required me to carry with an empty chamber, I'd be looking for a Makarov and an EFA-2 holster (since the OP's situation is the one it was designed for):
Russian Military EFA-2K Russian Original Self Load Holster by EFA https://www.amazon.com/dp/B01KYVG5C6/ref=cm_sw_r_cp_apa_sVTgAbF801G8E
The pistol is held in the holster with an empty chamber; when you draw, you push the grip down through the holster, while the slide is held in place, chambering a round.
It's not ideal, but it's definitely better than drawing and then racking the slide (and it's a one-hand operation). The downside is that it's only available for the Makarov as far as I know (which isn't the worst, I suppose; they're great, reliable guns). There was an outfit making them for Glocks, but their website appears to be defunct now...
http://www.thefirearmblog.com/blog/2015/02/17/spains-automatic-holster/
Regarding the ammunition, I'll throw in another recommendation for rounds made with the non-expanding fluted bullets (Polycase ARX or Lehigh Extreme Defender) if you can find them where you are.
The flutes do slow the bullet almost as quickly as a fully-expanded hollow-point. There's some debate as to whether they're as effective at damaging tissue as an HP round, but if overpenetration vs. FMJ rounds is your primary concern, that shouldn't matter much.
From a penetration standpoint, the ARX are probably better; the bullet is so light that it takes much less energy transfer to slow it down, and the big flutes seem like they'd transfer a lot of energy fast.
On the other hand, to my eye, the Lehigh bullet looks more like a traditional solid slug, so it might be easier to defend in a legal situation.
Hope you find something that works for you!