What is the process for applying for a Non O visa from Malaysia for a UK passport holder living with friends?

A UK passport holder currently in Malaysia seeks guidance on applying for a Non-O visa while residing with Malaysian friends in Penang. Key questions include how to prove their current address during the application, whether they can use a Malaysia Deposit Account Confirmation (MDAC), and if a letter from their family hosts is required. Additionally, they are inquiring about the appropriate timing to submit the Non-O visa application prior to traveling to Thailand in mid-July. Comments point out that proof of residence can be demonstrated via an entry stamp from Malaysia and note the strict requirements of Thai embassies.