@Martin *******
, Yes, if you get a multiple entry Non-O visa, you wouldn't have many things at the local immigration office.
You need to check the latest requirements in Penang or Kota Bharu if they issue multiple. Before Covid, you need to show a certain amount in your bank account, but the bank account didn't have to be in Thailand, you could use one in your home country. Even if you have to have funds in a Thai Bank account, it's only for applying for a multiple-entry visa (a one-time deal). You don't have to keep the money once your visa is issued.