You should talk to a few local tattoo artists and see what their thoughts are. If you find a very experienced tattoo artist, they would be able to tell you what they’ve seen work and not work related to stretch marks. Just go in and show them what they would have to work with I bet they’ll come up with something great that helps disguise the stretch marks while preserving the integrity of the tattoo!
Check out http://findtattooshops.com. Just enter your address or city/state and you’ll find all tattoo shops within a 50 mile radius of there. Good luck!