You don't need a home base.
The question you ask is too open.
You can obtain a non O based on retirement from a tourist visa or visa exempt entry.
Many threads on this.
Seems you might be eligible for a LTV which is relatively new.
You also state that you can afford an PE (elite) visa.
You do not need to be in UK or France to apply for SETV or non O.
Thinking you need to narrow the field on how you want ongoing living in Thailand.
Most unmarried guys are on annual extensions from a non O.
The non O can be obtained in Thailand or places such as HCMC and Savannakhet etc