Burner phone = replace it every time anything private touches it. $499 phone is ridiculous for that. Also, daily driver = not a burner since it will see private data.
I'd say go to qvc.com and search for "tracfone". It will bring up some incredibly cheap phones, some of them decent. They are sim locked to Verizon for 6 months, but the offered plans aren't bad if you don't need much data. Otherwise you can switch to another plan after 6 months. You could even just activate them and let them sit in a drawer for 6 months, so you can then swap sims when the time comes to take the phone on a trip. Depending on how much you travel, you could go through multiple of these annually and it's still fairly affordable. (Don't make e-waste, but repurpose them afterwards, give them to friends, etc.)
At this point I wouldn't travel with anything resembling a daily driver phone. I'd bring a phone (like the above) that has essentially never been used.
Not sure about using any type of phone for travel photos, since that gives Big Brother access to the photos. There's an app called Cryptocam on F-droid that encrypts the photos before saving them, but maybe that would attract attention in its own right.