I would like to tailor disarm on a way that one setup will be working for one policy group and another disarm set will be working for another policy group.
Tailoring the disarm setup is not possible. This setting is global, can be bypassed only, and instead, it is advised to continue with content filtering policies combined with attachment lists. For policy groups "Inbound Disarm policy:" can be set as "None" or "Disarm: Disarm the attachment".