I understand exactly what you mean. This appears to be a Pattaya issue and maybe just a few branches in Pattaya.
In your position I would go through the full statement and highlight all the monthly deposits. I have got friends who I know have done this and Jomtien Immigration have accepted it. Little bit of work on your behalf but a lot less work for the immigration officer.
In future why not open a second account and use one account for your visa requirements and a second one for all your spending.
to be honest I don't but I have personally done 50k Baht. I really use it as a back up now. But when I came on holiday it was my primary source of funds. One problem with having a UK based credit card when you live here is your credit limit gets reduced over time.
I have used the Halifax Clarity for the 9 years I have lived here. Zero commission as @Peter Scuba correctly says. But there is a beat trick you can use it for to get at a great exchange rate. You go into a Thai bank (best if they have exchange facilities) and ask to withdraw cash. There is no charge from the Thai Bank or Halifax. You just need to go online and settle the balance the same day. So there is also zero (maybe 1 day) interest to pay. You avoid the ATM charges for foreign cards and get the perfect exchange rate. Not all Thai bank branches will do this but I have never been refused from a Thai bank that has a Foreign exchange facility. If asked if you want to withdraw Thai Baht or Sterling always withdraw Thai Baht and you will get a great exchange rate. ππ