Unfortunately I don't have RSNetworx for EtherNet/IP; only for ControlNet and DeviceNet.
You can in fact use RSNetwor for DeviceNet to browse the POINT bus, just like it was a DeviceNet ! This gives you access to all the EDS-defined parameters in the module, which you generally also have access to via RSLogix 5000.
I tried manually setting the slot number of one of my POINT modules to a higher slot; when I cycled power to the AENT it went right back to the correct one.
Does RSNetworx for EtherNet/IP let you send generic CIP messages ? This is the "Class Instance Attribute Editor" in RSNetworx for DeviceNet.
I'm thinking you might have to send a Reset to Defaults message to the IR2, or somehow trigger a Sequential Auto Address function.