... with every replaced part and yearly power consumption costing as much as a new conventional low-power router? If the only thing it does is routing packets and you don't run any heavy services on it, there are low-power, compact and cheap openwrt routers out there.
Heck, you can take all these $$$, fly to a decent country visa-free, get a rabies shot and a lavish vacation. Why TF Americans don't ddo that is beyond me.
You can use insecure boot and not enter the password. It can't make stuff meaningfully more secure though, it just plain doesn't add any protection against evil maid.
Homoglyphs? Invisible text? Bidirectional text? Just highlight every line that goes beyond ASCII with yellow warning colors and require to vet it. Maybe make localization data an exception.
That's what I've been stressing in the first place!