He can use open system . I mean disposable water .If you give it a try let us know how it goes. I’ve almost always done dry to avoid handle material dust in my coolant. I made a very simple open top cardboard box around my vise to contain the chips/dust, then I can vacuum it up after it runs.
I did g10 folder scales wet a few times. There wasn’t a lot of cutting and it seemed to work well. I do have a 20 micron filter on my coolant line. I would imagine that filtering would be important, especially with g10; so that you aren’t recirculating abrasive glass fibers.
I looked into it a bit in the past and found a lot of differing opinions online. Some say it will introduce abrasive dust into your ways, some say it isn’t a real problem. I would think micarta wouldn’t introduce abrasives like g10 would. I would look at a filter system still. I think either nyccnc or grimsmo had a video showing simple filter setups.