Well... Well angus has alreafy mentioned he has an idea. Lilt can use her barfic inspiration to help you with that twelve.

You can also kick back a bit as Roy and lilt have better dexs. Lilt can squeeze into places no one else can. And she also has Minor Illusion. While she can't use it to create something large and move it. She can use it to create a sound of any volume.

You have the knowledge of that. Trouble with her is you need to convince the coward she will be fine