Why not go further?
There should be a master book of civil contracts that can be filled out in a "Mad Libs" sort of way, but nothing else is legally enforcable. Every sales contract or employment term is the same with only narrow, permitted variations.
This could streamline the legal system because it turns potentially infinite contract designs into a much more constrained problem space. You'd quickly build enough precedent that even lay people could understand the mechanism.
Trying to add a new term would require revising the master book, which would be a very public and political process that would likely shame the instigator (just why are you so desperate to force arbitration?)
The whole "contracts are a voluntary, negotiated, meeting of the minds" perspective feels quaint and 1700s, from an era before billion-dollar companies, and even before formal law schools. Negotiations are rarely between equal parties on a level footing these days.