Can I apply for a Non-O visa in Krabi and then get the stamp 45 days later in Chiang Mai?

There are very few reports of people successfully getting a Non-O visa issued at one office and then getting a year extension at another office EVEN if they have the correct documents for the extension AND filed a change of address and/or the TM30 notification of foreigner in residence form.

I'd say pick ONE or the other and sit tight until you get the Non-O issued and the year extension rather than get the Non-O and move to try to get the year extension at another office