I think your translation plans are good. It is better to wait until there is proof. I just found and read this today, it is a wonderful story and you have done so well with the translations and redrawing that it feels professional. Thank you for translating this series.
I usually read ファサ as more like "fuasa" > "fwasa"
If it were fabric I might translate it as "flap" but in this instance I think it's about the fur being silky/fluttering
Maybe "fwsh" or some variant of "swish"?
Thanks! I'll probably be needing to make some minor corrections to this chapter so that'll be the perfect time for me to update that while I'm at it. :3