DD
Having lost many beans to aminopyralid this year [
] I have the same issue with my bean collection.
What I am planning on doing is 1/3 sown very early; and grown indoors [hopefully in a warm greenhouse that I have access to], and 1/3 a little earlier than normal time; with the babies from the greenhouse sown as soon as they dry - again in the greenhouse so that I can extend the harvest...and the final 1/3 at normal time in the usual way.
At least then if it doesn't work, I've still hedged my bets.