I forgot how we pasken do we say it's just mehudar to use "mino" or is it a chiyuv? the picture explains it all.
1 Answer
Machloket Rabbi Meir an Rabbi Yehuda in 3rd chapter mishna 8: we pasken as Rabbi Meir who allows outside of 4 minim. The reason is that tying is not an obligation for RM so tying material is not a part of the mitsva and tying with a fift species is not bal tosif, a prohibited addition.
Summary: Good 100%. Lechaora no matter to hiddur.
The mitsva to make a knot for RM is itself mishum Hiddur, ze keli veanvehu. See SA OC 651, 1
ומצוה לאגדם בקשר גמור, דהיינו ב' קשרים זה על זה, משום נוי; ויכול לאגדם במין אחר.