user promotion (change) limits

I need to allow specific roles to change other specific roles, and only to a specific level (not the whole list of available roles), and without allowing the promoter to edit anything regarding the target user (such as profile).

IOW, user with role A should only be able to see users with roles B and C in the list of users, and should only be able to change a user’s role from B to C and from C to B.

I can’t seem to find where this plugin provides this level of control, but maybe I’m missing something?
Do any of the role plugins provide this? If not, could I limit the roles listed in the user list and the available roles for change via a filter or must I modify code in WP core files?