The 'marriage' paperwork is not insane. It might take up a couple of hours of your time once a year. If you scan and save passport pages, house book, wife's id, marriage certs etc etc, then you just print them off again next year. Easy peasy.
Mine was cumbersome to the point of giving up.We applied and were rejected despite being together two years. We appealed and got rejected again. I had 'a pal' in the UK embassy here who couldn't swing it. I contacted my local MP back in Glasgow who couldn't do anything. They were all terrified in case she did a runner once inside the country. This was decided by the authorities even although neither her, nor I, wanted to stay longer than two weeks. A couple of months later we got married and it was a different kettle of fish. Two six month visas, a one year visa, a two year visa, a five year visa and a ten year visa all followed with no problem. Wedding cake solved everything! 😎