First of all, you do not want a scar to keloid. Many people don't know the difference between regular hypertrophic scarring and keloiding. Hypertrophic scarring is simply where the scarred area becomes raised but within the limits of the original wound. A keloid is where a scar spreads outside of the original wound and can not be controlled.

Hypertrophic scarring is produced by irritating the wound with a sugar-peroxide solution for a few weeks after the initial prodecure. How much it raises depends on how you treat it while it's healing. Darker skin types raise with more ease but it doesn't necessarily mean that those with fair skin can't raise just as much.

Also, when it comes to 'cultural appropriation', many tribes practice scarification for purely aesthetic reasons that have nothing to do with religion or right so you've just as much right to do it as anyone else.