All comparing YT Sheini to the minhag of Gerokts is A”H.
How can you can compare something that was implemented by Bes Din and accepted by all Klal Yisrael ופשט הדבר בכל ישראל (see רמב”ם הלכות ממרים ב) nothing can override that status of a Minhag. Gebrokts is just a Chumrah that some accepted AS A CHUMRAH – not as a Halcha.
I’m not implying to say it is muttar if your minhag is to be makpid, however, Hetoros Nedarim via a Rav certainly can help. (e.g you are by in-laws that do etc) in any case, the comparison is off.