Regarding piercings there doesn't seem to be a good way. For the EVE Body from SMSims there are some clothes which have enough "space" that the smaller piercings don't clip through them, so you can still add them.
Most clothes from Lynx for the Allure Boobs also have quite some space that these can still be added with clothes on. But for sure they will clip or show for other clothes CC. Simdulgence has some way to activate and deactivate the piercing through the Sim Invenory which is probably the best idea. If Nisa would extend her piercing system it would really be the best but no idea if she is even planning new features or just maintaining her mod for updates.
For LittleDoxy/Athena...good catch...the Patreon is down and all stuff seems to be deleted. I think there was no update for a few months already and in some posting she questioned herself to keep doing CC. So seems she finally decided to quit without any notice. So only the older work on Loverslab still available. I always have to wonder why some creators take everything down. They spent lots of hours to create sth. and it kinda goes to waste to not share it. I modded in the past for some other games and never took anything down.
