I wouldn't get a tattoo of a six pointed star despite it being the stolen Star of Vishnu, today it represents the jews and that would be reason enough for me to avoid having that on my skin...
I don't think Satanic tattoos are gonna get you killed in surgery.. I've had a medical procedure that required me to be naked since getting my back covered with unmistakeably Satanic imagery.
Most people in power will not see you as a threat if you simply tell those who would have something against you that you are LeVayen or any other brand of 'safe' Satanist in regards to your tattoos. Freedom of expression is a toll of the jews to remove the power of a Gentile and if a Gentile wishes to get a tattoo to express themselves (provided they are of legal age) then all the power to them wether someone else thinks its just attention seeking, external identity or not.
However, I wouldn't advise getting a swastika tattooed on your forehead because this more than likely WILL attract negative attention due to the massive social stigma associated that even a person blind to any of what is going on will see that as a sign of evil... The swastika is Satan's true symbol of power.
HAIL SATAN!!