Symantec Management Suite Standalone Inventory

We are currently migrating from Altiris 6 to Altiris 7.1 and we are looking to include the non-supported OS's like NT4 and Win2K in the inventory information. We were hoping to use the Standalone Inventory set up to acheive this but I'm finding that this is probably not possible. Does anyone have any ideas or pointers to guides that could assist us in including the NT4 and W2K servers/workstations inventory in the new Altiris 7.1 setup.

Thanks for any help.