Sorry I wasn't around to answer the cream substitution question - I hope J's answer did the trick. My first thought was that I saw no problem using milk.
Woo hoo, there's an Andrews Sisters movie on Turner Classic Movies - must run!
Quite alright. If you think that milk would be an OK substitute instead of the butter concoction I'll use that because we have to keep FIL's sugar and fat down. 10-Q.
My daughter loves the 40's, I'll give her a call and alert her to the Andrew sister's fun.