Hi, unfortunately we’ll not be making this change specific to some themes. Renaming wp-admin path itself is a complex process. So it’ll complicate it more. And the worst case scenario is that renaming wp-admin will not work until it’s changed in theme code itself.
You don’t need to do anything with custom login page of the ARMember plugin. Just rename wp-admin path name from HMWP settings so that template developer can check the issue/error.