The genital skin is thin enough to allow virus to enter with an obvious break in the skin
I don’t think there are safer positions to avoid transmission, no
Once you have HSV 1 in one location, it would be rare to get it in a new location, correct. How it happens at all is not clear to me.
If you take daily antiviral meds and your partner uses condoms, I think transmission is incredibly unlikely;.
You cannot know when viral shedding is happening – that’s the issue – it can be without symptoms.
shedding happens when virus leaves the genital skin and either goes into the clothing or into another person.
You may be worrying too much about transmission here – it is rare and shedding is decreasing over time for sure.