Earlypea, sorry you had the bean weavil. Horrid things.
Fortunately they don't happen too often in UK. Checking for them is always a good excuse for playing with bean seeds during the dark days of winter ..........
but as you say, the correct way of dealing with the problem is packing them airtight and sticking them into the freezer for at least 2 days.
On taking them out again, the very cold tin (or glass jar, I use jam or sauce jars) must first come up to room temperature completely, including the seeds inside. This will take several hours or the best part of the day if the tin is big. Once everything is a room temperature, individual packets can be taken out, sown, rest of packet replaced and then put back in the freezer again.
Moisture is the problem and cold surfaces attract moisture. By letting the seeds get to room temperature before unpacking you keep them dry.
The beans will not disintegrate. When you start sowing note the rate of germination. If that is good or normal, they can stay in the freezer, but if they were frozen a little too moist, then germination might be down a bit. An indicator to renew your varieties a little sooner than you had planned. Good luck