XF 1.5 Force user to update signature?

[Fred.]

As far as I understand it's not possible to fore a user to update their signature?
Or is there a way to force them?

I have an old user that still has 3 links in her signature, we only allow 1 link in the signature now.
I would like to reduce that to 1, but I don't like to edit their signature.
I can ask of course, but it would be nice if we could force them to update the signature at the next login or so.

 

[Mike]

You can't force a change to this.

 

[Fred.]

Ok, Thanks Mike.

I edited her signature.
She also spammed in the about me: field. I also removed that.
I gave her a warning, If she does that again BAN!