The Maltese Cross idea would be a cool, if not slightly controversial logo for a T-Shirt. Anything past that might catch the eye of Mr. James. The last thing you want as a colony is a copyright infringement case.
Just my 2 cents as a Brother, business owner, and biker.
ZAX,
pman
PS -- From my personal experience with screen printers: most will not touch a design that smells of potential lawsuit. If you need to see where the law handles "parody", read the TOS on
www.cafepress.com .