Can i lock a font into lower case?

I create a lot if Indesign templates for my clients.  Many of them for design purposes use all lower case for some things.

i.e. A name would appear as JOHN smith

I am able to caps lock JOHN so that no matter what name I type in there from the template it stays all caps.  But I cannot figure out a way to lock the last name so that no matter what I type it's always lower case.  This is important so that if someone is covering for me they don't accidentally add a capitol letter to things that shouldn't have them.

Thanks!