Darn, that's unfortunate.
You'll need at least a second light source then and treat the on lens light like you would fill from a ring light. That might actually work nicely for a diorama. Consider the on lens light as sky fill, then use the key as the sun. With a 1/4 CTO on the key I bet you could blend them for a nicely convincing look. It'd be worth exploring the concept anyway.
