I have a first generation Phil machine, and have never had a problem picking up thread when cutting 3mm or more from spokes. Of course, if you trim 8mm off a 10mm thread, the risk of not picking up the remaining 2 threads increases, but even in the worst cases, I damage less than 1 out of 100 spokes.

To the OP -- you were asked where you live. If you enter that into your profile, people will have an easier time pointing you to a local resource.

I'd gladly cut your spokes for $5.00 for the lot, but there's $5.25 shipping in each direction, and you should easily be able to find a local guy to do the job for less than $15.00