If you have tested the idea on two machines and got clogged filters why are you pursuing it further?
Here is another test. Take a small shallow container with about 2mm depth of raw coolant and just let it sit in a heated room. Many coolants that are intended to be mixed with water actually contain some water in their original raw form. When this water evaporates off the raw coolant can turn into a very thick gummy residue or even into a hard varnish-like form. I am pretty sure you could destroy ball screws and linear guides by having this form in them. I also think that spindle bearings would be a little unhappy.
An open mind is a virtue...so long as all the common sense has not leaked out.