Help with custom art for madkatz KE

so my boyfriend bought a madkatz KE last year when they were on sale and asked me to do some art for him. however, he didn’t really stop to think about the fact that the KE doesn’t have a panel you can just lift up and put the art under. has anyone found a workaround for this?

You print it on fancy adhesive label stuff from Kinkos

thanks so much!