Extremely late but I was reading up on the Filian stuff and came across this clip from her own channel that's hilariously ironic given recent events:
There's also this clip from a few months ago about her likeness being used in some mobile game, where she seems very much aware of the circumstances around her model being publicly for sale:
According to /vt/ posts from before the whole nendo shitshow, Filian's supposedly had an original model in the works for years now -- she announced that someone was working on her "vtuber model"
back in 2022 (timestamp 9:05 if link doesn't work), but that model has never been shown. Multiple people have probably brought the issue up to her at this point, so I'm not really sure what the hang up is on getting a new model? Even if she feels like her brand is heavily tied to the Rindo model now, as many others have said it's definitely possible to commission something similar but legally distinct. I think it's worth highlighting that Filian's "model-sister" of sorts Gosegu from Isegye Idol has done exactly that.
Gosegu also started out using the Mint model by Komado, with some slight modifications (her profile indicates she got permission from the creator for her activities, though). According to
this Korean site, she and her agency originally tried working out a contract with Komado but couldn't come to an agreement, so she held a contest for a new design, with the winner chosen through fan votes and approved by Komado (? not sure how accurate the TL is). She's transitioned to using an even more modified version of the Mint model to gradually move away from the character, and I think her soon-to-be-new design actually does a great job of being reminiscent of Mint while also being unique.