Hmmmmm, a tough one.....if "they" decide you must go you won't be able to offer less pay for a probationary extended period.....it might work if you are desperate enough and have many commitments, but trying to get back on the regular payroll would be very difficult with all the reasons in the World by the management.
There's no substitute for experience....either you've got it or you ain't.
Personally I have always worked within my area of expertise, but being a qualified fitter and turner (retired) that covered a lot of ground over a span of about 50 years .
My advice would be to look for another job within your field of expertise, before they decide to "let you go".
Other than that, all you can do is hope to rapidly improve and learn the ropes before you run out of rope.
BTW, if they were willing to employ you knowing you lacked experience, it appears there is a shortage of CNC turners, or they're paying peanuts........but be careful, you could end up being just a CNC lathe operator if someone else continuously has to be at your elbow.