How to hide images in Signature for multiple groups?

[Spada_FMC]

Hello,
I have a 2 free usergroups and 2 paid usergroups. I would like to know if it's possible (and how/what changes are needed) to prevent the free usergroups from viewing images in signatures.

I've seen some postbit modifications that hide avatar and complete signatures as well as post count limit mods that display "You need X amount to view image" but both of these leave a lot to be desired.

My basic question is:
Is there some easy modification to the postbit & postbit_legacy code I can make that will hide images in signature but still allow text and BB code.

We want this so that free subs cannot see pictures of families or other personal images in signatures unless they are paid which gives us more info to do background checking and approval processes.

(Here is an example of the mod I spoke of above)
https://vborg.vbsupport.ru/showthrea...=144629&page=2

Thank you
-Spada