I would also suggest trying a filament cutting tape like 3M knifeless-tape or wrap-cut tape on a job like this mate. I appreciate the tapes can be a bit temperamental at times and even flawed in some ways. but they do give the best solution to a job like this.
Wrap-cut Filament Tape
https://www.langeman.com3M Knifeless Tape
https://www.3m.co.uk/3M/en_GB/graphics-and-signage-uk/knifeless-tapes/
