What should I do for my family's visa status after obtaining a Non-B visa in Thailand?

Hi All

I am awaiting a job confirmation. Should this be successful:

My current exempt stamp (including my family's) expires on the 15th. If I get my Non B, what should I do for my family?

We have one land border bounce left which may be extended. That allows my family two months in The Kingdom. I am told that they can only transfer their stamp to a Non O Dependant Visa at immigration after three months of me having my Non B.

Should I rather ask immigration if they can make an exception to do the transfer sooner?

Thank you so much for your assistance🙏