Yes. Nothing changed in Thailand. You can get a single entry non O for visiting family and extend it in Thailand using either 400k in a Thai bank account for 2 months or proof of 40k a month for 12 months of income to a Thai bank account
you could, if you was near one, just go to a Thai consulate and get a METV or SETV on the same day. That way, you only pay if you get the visa. Just check the consulates out as some you need an appointment as they can keep odd hours of when they are open
single entry just says this. Doesn't state the length of bank statements or amount of funds
For Single Entry (stay up to 60 days)
A current passport with validity not less than 6 months and at least 2 blank pages. Applicants must fill in online visa application with their given name(s) and surname as appear in their passports.
Printout of visa application form submitted online, with bar code
Travel booking confirmation
Proof of accommodation in Thailand e.g. hotel booking, invitation letter from family or friend in Thailand
Financial evidence e.g. bank statements, proof of earnings, sponsorship letter
Confirmation of legal residence in the UK or Ireland (if applicants are not nationals of these countries) e.g. long stay visa, residence permit, BRP card
If your going to attempt a way to do it which isn't specified, I would find out if it is going to be accepted or your going to lose £150. There are no refunds on denied applications.