As often as these tatoo threads come up, and reference Leviticus 19:28, I am puzzled that there are not threads devoted to 19:19 “Nor shall a garment of mixed linen and wool come upon you. “
Tatoos really seem to get some folks fired up, while wool blends not so much, and yet, there they are, given equal emphasis in chap 19.
There is nothing necessarily forbidden regarding a non-Jew wearing linen and wool or having a tatoo.
I would OPINE that sections of Leviticus are advisory to non-Jews and/or not applicable, as they have to do with ritual purity.
View Leviticus as a safe harbor. Jews must stay in the harbor, as that is the job for which they were chosen. Others may venture out -— at their risk.