I understand your OS does what it needs to but what about pfSense as OS? Isn’t is much more powerful and professional? Your router also seems to be powerful enough (x86 like, where pfSense lives). I must say I don’t know much about the porting process and how hard it would be and AFAIK there’s no ARM port of pfSense but there’s work on it. What do you think? Is this even a feasible stretch goal? (3 year warranty isn’t that exciting because hardware usually doesn’t break like that)
PS: yes this forum software is modern and stuff but is has no real hierarchy and no pages and a few more things which would make it more kind of professional (instead of hipster like) and I don’t know how your experience is but mine is that once you start to have a few more pages it’s basically unusable.