I think it works except for the minnows. They are a cold water fish. If I were you, I'd consider doing a group of tetras instead like neons/cardinals or rummynose tetras. You said you wanted a school of tetras, so maybe two contrasting schools would be cool.
Also definitely the more the merrier with khuli loaches. They'll be more active in a larger group, which means you'll see them more.