Add project name to Subject line

Hi,
I am just 2 mins old on this forum and haven’t done any programming since ASM and CBL… I will not even try scripting… but that said - I am still looking for optimized solutions.
I still stick to Mail on my Macos instead of replacing it with another and I need some help on a script that can be used with Rules. The situation is that I have about 15 different e-mails (entrepreneur with interests in lots of companies) and each company have several projects.
When receiving an e-mail I will check the From-address and then add a prefix to the Subject line before it appears in Mail. The Prefix should be like [PROJECT] and since there can be many different prefix, I need to be able to duplicate+change the script where I replace the prefix with a new one (meaning one prefix for one project and another prefix for another project). But, if I can have one script - I hope I am clever enough to duplicate and update when needed.
I am prepared to pay for the script when it proves it works.
Hope to hear from someone more clever than me out there…
/morten