I understand your preference to use Hibiclens over ABX, avoiding things you don't want is important, I agree. I just want to share the info I have, as I spent a long time researching this for my last UC.
If you are GBS+ early on, you may not be at delivery! And even if you are colonized at delivery, the odds of your babe getting GBS sepsis and having a serious illness is still low. Even lower if your birth is quick. Its one of those things where the odds are low, but if it happens, it can be very serious. In the UK, they don't test every woman, or treat for it, they don't think it's worh the cost (!). So it's a risk many people don't worry about.
The few studies I have seen on Hibiclens used wipes, several times, and also wiped the baby down. It was not proven to be all that effective, thus far. I can post the study links if anyone is interested. I'm really not sure how this got so popular, I think it would hurt!
I have also heard of CPMs suggesting douches, along with garlic. I don't think douching with anything is a great idea, putting things far up there can cause infection, especially after your water breaks. (Isnt this why we avoid all the extra vag exams?)
I totally agree that antibiotics are overused! My sons pedi has a big poster in just about every room that says how you aren't getting any, in almost all cases (cool doc!) GBS sepsis ABX is a one time thing, and you only get it if your positive. It won't add to ABX resistance. I can see wanting to test negative for the hospital, as it does mean theres lots more rules!
I was GBS + for my last UC and I got some ABX to administer to myself, from the local pharmacy But you can do that in Mexico.
Here, you would need a script.
No matter what you choose to do, it's always a good idea to read up on the signs of GBS sickness, as Knowledge is power, regardless! I'm sure you have more knowledge of this, being a nurse and all. Can you post the symptoms for me???
Let me know if you want the studies, maybe it can shed some light on how much you should use, how often, or when. And yes, you CAN get it at target. it's the same thing as online.
Hope this helps! I don't know all that much, but I have studied this

Best Luck!!
(edited for clarity and many typos!)