This is why I think that rules should allow for 8-10 chickens for backyard flocks. You can adjust much better that way.
But, you could buy more chicks, then sell what you don’t want right away. There may be a 4-H kid that would also welcome a few new chicks. In my Ohio county, you can show egg layers (pen of two) that are “old” -over 1 year, or “young” -those hatched after Aug 1 the prior year (and are under 1 year old at fair time). So, for several years we have purchased Feb chicks so they are laying by fair, and for the “young “ category. You can call the county 4-H office to ask if they know of anyone willing to split an order.