i am a pre-press operator and can do what you want professionally.
i am ready to give you a sample before starting, just send one of your raw design and i will give you color separated file as a sample.
i have finished many of projects like this before (3,,... up to 12 spot colors per file), i know as well about color trap, overprint, over lap, mask, repeated pattern unit, ... etc. .
Please check my profile.
Kindly my quote is a vary and would like to check your files to confirm my bid