I think a good starting point is to simply offer in-person training at key points in the campaign (on filing, after a primary win, and before the general election).
But also consider downticket races like secretary of state or state ag. Then you're talking state parties who have almost no power at all.
So yeah I think carrot is definitely better than stick, but there basically is no stick. I do think the DCCC should set up gapps for every general campaign and provide it for free, and should probably also offer it to professional Democrats, also for free, but this is a larger tech infrastructure question that starts to include organizing tech, website tech, VAN, email tech, etc. I personally think we should provide all those things, but there are a lot of (vendor, of course) politics involved, it's not cheap, and things like 2FA are so far down the list you can't see them. Again I think we agree, I just think a lot of people think the party controls campaigns and that's largely not the case, and even when it is there are arguably more urgent issues (campaign finance law training, ex) that could benefit from any kind of standardization.
My team did some work for the KS04 special election last year, and now we've developed a service for political campaigns. But traction.. maybe we're getting screwed by this approved vendors thing.