SnipeIT just cares about serial numbers, models and manufacturers (you can just use a serial number in the asset tag section) for assets and I think consumables drop a bunch of those requirements. You might be able to put groceries under consumables? I’m less familiar with consumables in SnipeIT to be honest.
Adding to this: doesn’t CAD usually want 3D acceleration? I would definitely try running the CAD software with the same VM configuration you plan to use in your Proxmox VPS first before progressing to make sure it (a works at all and b) is responsive enough. You could even try nesting Proxmox in Proxmox to emulate the kind of performance you’d had on a VPS.