I don’t think the chassidim wear peyos because the Yemenites do but rather because its brought al pi kabbalah.
Also what would the zchus be in emulating the Yemenites’ minhagim or along the lines of your thought- emulating the minhagim of the dor dea’ah?
I am not convinced that eating chamin instead of chulent will act as a meilitz yoshar for me at my din v’cheshbon.
The minhagim that they took on were for their reasons and the minhagim that we have today are for our reasons.