I guess you can also use this machine for plotting, just plot with 2 threads and 3400 RAM, then Just check the debug.log file to see if farming is affected in any way, but I doubt it, I think you have enough resources to plot and farm on this machine.
Imho you are wasting resources on this machine. Maybe you can plot 4 in parallel on that NVME drive; with 2 threads, 3400 RAM and 2h stagger between each plot. But I would recommend you trying first only with three though.
Sure, go for it! I think the idea behind this project is using resources we already have available (at least at the beginnings ).
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