Would it be possible to have a rig for the job with some CPUs working together possibly on one motherboard ??
can understand that mining XMR doesn't make much sense from a ROI point of view
thinking of this as a novelty decorative installation type thing
Probably better off using a dual CPU server motherboard, but again it dosen't make sense to do so from scratch. You would be better off and accumulate more XMR by going with GPU rig to mine whatever is most profitable and then converting it to XMR.