Hi Saint,
Maybe a couple of issues, are you uncertain how the people you care for are going to interact, with you, OR how the external community will interact with them if they perceive you as being 'odd'? Which of course you are not. Or how the external community will react to you?
A few thoughts. In my experience you are invisible. People utterly ignore special people and their carers. I can take my wife in her wheelchair in the hospital I work at and I am not recognised. I walk alone and I'm stopped every 10 meters for a chat with people who know me.
What is odd about wearing nail polish?
I don't because I work in a hospital and it is a hygiene thing.
I wear a (false

) diamond stud in each ear, large feminine ones. I also have one inch gold hoops in each ear. Yea I look like every other guy in the place

. Most woman don't wear my ear rings. Some people look, but lets get real in life. I don't give a damn what other people think.
As a special care worker you are on of the extraordinary people who makes the world work. You are a saint

, I know. Wear your nail polish, wear it with pride, and if any one ever asks, just reply; Cindy said it was ok. Should confuse the crap out of them.
Hugs
You are special thank you for being you.
Cindy