IIRC I actually used some tape when I was starting to learn the violin. But it does not make sense after that. The different tones are a lot closer to getter than on the gitar, so you can only mark some of them. Then you are back to the start since you still have to use other means to know where to put your fingers.
I have done something similar myself. First I tried to put the TXT record at the same domain which I did want to redirect. To tackle the CNAME problem did I come up with a complicated solution which I also did write up (https://github.com/tellnes/dhr2). But when I actually tried to use it was it too complicated.
What I'm actually using now and have been using for some time is just a simple TXT record at a subdomain (eg _redirect.example.com). I also have a script which looks for these TXT records in my zones and adds A/AAAA records when needed.