Perhaps a simpler move would be to stop party affiliation being published in the ballot paper.

Then if you wanted to vote for your local Tory / Republican / whatever you have to look them up, find out their name - and even compare policies.

This is not banning parties (Parties do at least have value as stability mechanism) but it discourages blind partisanship at least

Edit : it is also testable - one could randomly do this on ballots across nations and watch the outcome. I doubt the null hypothesis is same results as ballots with party affiliation.