If I could add (not me of course but a professional) a 360 camera aftermarket system to aid in parking etc this car would have everything I want. The only reason I would consider leaving for the newer Toyota Prius is this. Such a game changer of a feature. I would be willing to pay up to 2k instead of having to change vehicles. I love this car and that's the feature I'm longing for. Ugh.
I really would have thought someone would have a serious choice/option...
A quick search online seems to indicate that there are aftermarket systems available, but I don't think that I've ever seen one installed on a vehicle that didn't come with it from the factory. An aftermarket system would likely be very expensive- probably close to your $2000 budget for a decent system. The problem being- you'd then be reliant on the installer for any issues that pop up- and none of it would likely be covered by your car insurance if your vehicle ever needed repairs after an accident.
It's kinda surprising that Honda doesn't offer a 360 camera system in the Accord yet. Most of their competitors have offered them for a while. I think the Camry started offering it back in 2018, the Sonata back in 2020, Nissan has been offering it for a while too. Honda does offer it on some of their SUVs, so maybe Honda will add it to the Accord during the mid-cycle refresh for 2026.
If you really want one- that's what I would probably do. I'd wait to see what changes are in store with the 2026 Accord refresh- and if they don't offer it- perhaps consider trading your existing Accord in for a vehicle that comes with one from the factory. Aftermarket stuff like this can be complex and you really need to find a shop that knows what they are doing- and will back up their work. If you have one of those available locally- great... if not, I'd probably prefer to stick with an OEM system myself.
I know that you said that you were looking at potentially replacing your Accord with a Prius- have you looked into the 2025 Camry? Its MPG is only a little bit lower than the 2025 Prius and it's probably a car that's closer to your Accord in terms of comfort and size. You can get a 360 camera in either the XLE or XSE trims- and those get in the high 40s in terms of MPG (or mid-40s if you opt for AWD). I think the Prius gets either 50 (AWD) or 52mpg (FWD) in the Limited trim with the 360 system.