Thanks for the suggestion, Matthew.
I’m sure this would be possible, but my concern is that it might get hard to manage if there are multiple date ranges that a price book changes, before moving back again, then maybe to another all together, etc.
Would a simpler approach like Bulk change price book assigned to customers/etc work for you? If so, we can close this if you can vote for that thread. If not, can you let me know why (just so we don’t fall into the trap of building something for you that suffers the same problem)?
Cheers