Give Character Proficiency/Expertise Macro (DnD Sheet)

Hi everyone,  I have a player who'd like to have a "self-esteem" homebrew.  Basically it gives and takes away proficiency/expertise in skills. Can I write a macro wwhich changes their characters proficiencies? (I'd like to keep it to a single click on a button, instead of having to change a bunch of things every time their self esteem changes. Thanks!

ChatSetAttr is a script that could do this, but it would be a complex set of macros, because you would also need to record the original state somehow so you could restore it afterwards. It would probably be a lot easier just to tell a player "You are +3 [or whatever] for this unless you are already proficient" like you would at a physical table. This is pretty much how paladin aura saving buffs are handled.