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This is a solved problem up here in Canada, at least in my experience.

Most restaurants will assume you want to split the check by default when you're with a big group, and most restaurant software lets you ring in dishes by the seat rather than by the table, while also splitting shared things across all of the checks at a table (this also helps service teams deliver the right dish to the right guest). Add to that the convenience of chip and pin machines that come to the table, and it is just a non-issue.

I'm American, so I understand that lots of restaurants in the US resist doing things this way. But it is quite silly considering that the software and hardware already exists to handle it all.