The other thing to bare in mind is the rose tinted glasses, and the culture shock of returning.
The first six months while we waited for things to start up were awful, and we nearly left again. It was expensive as well, not working for 6 months, not able to sign on, burnt through our savings at a serious rate.
Personally I would not be paying anything to a lawyer or visa expert to put the application in, all the advice you need it on websites and expat forums who have. and are going through it now.
There was, and may well still be, rules in place for long term marriages as well, with visas being issued for them if they could be proved to be genuine and long term. Rather than popping over to whatever SEA and picking up a bride.
I do know of someone who used EU human right laws to get his wife granted a visa to the UK to marry, something about the right to marry, even though he didn’t have the evidence, funds etc. He was a hipster weirdo from London so he may have just have threatened to wear even tighter and brightly coloured jeans if they didn’t issue it.