Practically impossible with companies moving to electronic forms. I've found every electronic form presented to me has had less than zero ability to actually negotiate with the other party.
I've been working remotely for nearly a decade now, and the majority of contracts I've signed have been in electronic form, and for each of them there has been back and forth about certain items - IP and copyright in particular always coming up - and we go back and forth until the wording and meaning is something both parties are happy with.
Only once that's happened do I need to sign the electronic form - and that's where the negotiating leverage exists, because I don't need to work for someone if they impose conditions on me that I am not willing to accept.
They told you that already "if you don't like this then why are you still working here".
The way to get this limitation removed is to hand in your resignation. Preferably after finding another job.
Make sure that before you sign a contract at the new place, that you strike out anything in the contract that requires you to hand over IP of things developed outside of company time and outside of company resources.