to pay Tax in Thailand you must be tax resident and have assessable income. Assessable income includes foreign sourced remitted income and not just domestic income.
spending 180 days inside the Kingdom in a calendar year means you are Thai tax resident. Being a Thai tax resident and having to pay Thai tax are two completely different scenarios.
not quite accurate. You can legally be Thai tax resident and never have a Thai tax filing requirement. Tax residency just means you are subject to Thai tax law.
Unfortunately you don’t get to choose where you pay taxes, governments decide for you. You will be taxed in the country where your income arises and you will be taxed in the country that you are tax resident.