On the ASA web site, there is a page called WORDS.TXT, which is a
compendium of terminology developed by several of us a year or so ago on
a Compuserve Forum.
It may help.
The term "Creationist" is usually taken to refer to one holding the YEC
position of ICR. Then there is "Old-earth Creationist" and, in your case,
"Uncommitted-as-to-time frame Creationist." Awkward? Of course.
Burgy