INTERNATIONAL DRIVING PERMIT

I understand that, whilst a UK IDP is valid for twelve months, Thailand only accepts an IDP for the first 90 days of a visitor’s stay.

To continue driving here, One is expected to take and pass a test so as to be granted a Thai driving licence, is my further understanding..

But if, after 89 days for example, a visitor leaves the kingdom and returns shortly thereafter to Thailand, would a fresh 90 day IDP validity period be afforded to him/her/zer (so as to avoid offending any “non-binary” readers)?

Conversely is, say, only one 90 day recognition of an IDP countenanced in a given period (12 months, for instance)?

I have been offered the use of GF's brother in laws spare car next time I'm in the country, not sure if I should take them up on the offer because of the insurance implications, I'm told that the car is insured but what happens if I have an accident (I'm aware that it will be my fault) ? So any advice would be appreciated.

Before my next trip to Thailand, I decided to finally look into options of riding the rental scooters there legally - mainly for insurance purposes. I hold a B-category (car) driver's licence, which allows me to ride a motorcycle up to 125ccm and 15HP in my country and many other European countries. This is obviously not the case in Thailand.

I identified the following options to get that right in Thailand:

1. Get an A-category driver's licence at home and an International Driving Permit (IDP) - the drawback of this avenue is that the course and exam for this licence involve riding a heavy motorcycle which I never rode and have no intention / need to ride, so it would take an extra effort for me to learn it and pass that exam.

2. Get an A1-category driver's licence at home and an IDP - from what I learned, there are two conventions regulating the IDP: Geneva (1949) and Vienna (1968). The 1949 one does not have a box for category A1, the 1968 one does. As I understand, Thailand ratified the 1968 (Vienna) convention in 2020, so since then it should be legal to ride A1 motorbikes (125ccm, 15HP) using this form of IDP with the A1 box checked. Can anyone confirm this?

Even if so, the drawback of getting the A1 licence is that, while the course costs almost the same and takes as long as the A-category, it gives me few additional rights in Europe (as the B-category that I already hold basically encompasses the rights granted by A1 in many European countries).

EDIT: I found some evidence elsewhere which might suggest that A1 on the IDL is not good for riding scooters in Thailand: [members only]

3. Get a Thai driver's licence for scooters - is this possible to do on a visa exemption or tourist visa? How long would it take and how much would it cost? As I mentioned, the main reason I'm looking into this is for insurance purposes, so the document must hold up in case of being challenged by an insurance company.

I'm leaning towards options 2 or 3 - any advice will be appreciated.

Does a full UK driving licence give you permission to ride a 125 bike in Thailand if you get an international licence?