Can I get a 6 month METV and extend it for 1 year after my Non-O visa expires?

Non o 4th Feb 2020 that is my visa expires date will be going to KL late January so will get 90 days stamp till approx 1st May 2020.

For personal reasons I'm struggling with the finances to do a non o next year will have to do 2021. Can I get a 6 month METV and use it with extention for 1 year. We have friends in KL and Singapore so have visited for our 90 stamp not done any border runs and will do the same with this. Can I apply here I live in Huahin is the money just £5000 in UK account or my Thai bank account.

I have tried looking on line struggling a bit and you have helped in the past. Thanks you do great job