I have a similar problem myself. Not the filming aspect, exactly - as I am over 60 I doubt anyone would find me wank bait, but I am always concerned the masseur might have a partner who doesn't know about his partner's side hustle and burst in and cause a scene - this happened to me in Barkingside about 20 years ago, and it was embarrassing and uncomfortable as they ended up coming to blows, while I got my clothes on and left in an oily state - not pleasant on a cold night in January.
Like the OP I don't mind the more sensual aspects, but most masseurs round my area seem to be late teenage/early to mid 20s, who use massage as a cover for more exotic activities and I am not really into wanting "escort" serviices. There is, for me, something a bit seedy about a man of 62 going to a 20 year old for sexual services (nothing wrong with it for those who think differently). I genuinely find massage helpful as I get very tense because some of my work is quite physical, and I get tense shoulders, neck back etc. I don't want it for ten minutes foreplay. I did phone up somebody in my area not long ago, and got a list of very strange and irrelevant questions (was I hairy or smooth, cut or uncut, top or bottom etc?) so obviously we were not on the same wavelength.
I used to have a mate of a similar age to myself, and we used to have a massage exchange every Friday evening. He was married and bi-curious and there was a little bit of playing about but the massages were the main thing, but he and his family went off to Glasgow a year or two ago.
Somebody suggested to me that, with rising bills and shorter working hours a lot of men who advertise handyman/odd job services in free newspapers and cards in sweet shop windows would probably be prepared to help me out wth genuine massage, but in all honesty, I would be too embarrased to broach the subject, and , I would feel uncomfortable getting a possibly straight man to do it and then perhaps make him feel embarrassed or even ashamed afterwards (this happened the first few times with the Friday night mate I mentioned earlier), though he became OK about it when he knew he could trust me.
I'd just add that as I get high blood pressure, which gives me ED from time to time, sex is not the prime motivation for me - I just like touch and the sense of being smoothed out. Like getting your hair cut, it's nice to have company from time to time, and to feel better afterwards.
Does anybody have any advice?.. I would feel happier with a man over 35 , not a late teen or twentysomething.
Perhaps us older blokes should set up a "massage exchange" system, though I suspect Facebook would not be happy with the idea.
If you have been thanks for reading this tale of woe. I have been as honest as I can be.