I am aware that 1Password's response has been tepid and useless corporate bluster, but I've sent in my own personal support email in the hopes that continued pressure might get them to wake up. This is not a template as it contains quite specific personal details, but feel free to use it as a basis to tailor it if you remove those. (Unless they also apply, in which case, have at it.)
https://gist.github.com/glyph/c4c86ea19e47f9e6e3862ce23d4053d1