thanks. That reads like they are authenticating your income rather than your signature, albeit on the documents you provide. What does the affidavit letter say?
Normally they won't give you a 12 month stamp immediately but an under consideration stamp for 1 month to give time for the checks etc. You can speak to immigration about the best way to handle it, they may well be flexible enough to accommodate your agenda but as I understand it you need a re-entry permit that just covers you for that under consideration period and nothing else.
so does the Norwegian embassy authenticate the income or just that you have signed to say its true (even though you have to show tax returns etc)? The reason that many embassies have stopped providing income certificates in the last few years is that Thailand were insisting they authenticate the income
that's a question you need to ask of where you will apply for the visa. It's not possible inside Thailand, nor in surrounding countries, if one is based on being over 50. It may or may not be possible in your home country to get the 2nd visa (a dependant visa) at no cost but everyone does need their own visa.