First, there are giant forks specifically for lifting poultry.
You could try using them, they might work, but they’re really meant for lifting and removing, not flipping it. If you use them, you might end up (and I’d be ready to go this route), removing the chicken, putting it on a cutting board, flipping it there, and putting it back in.
However, if all you’re trying to do is sear all the sides of it…it’s not going to get all that hot. Just turn the burner down so the oil doesn’t splatter while you’re working (even if it’s not now, it will when the new, fresh flesh hits the hot oil), and use a couple of regular forks to roll it over in the pot/skillet. I think you’re having trouble finding anything because you’re overthinking it. It’s like trying google how to stir noodles. Just flip the chicken over, it won’t be that big of a deal. But, as I said, my biggest tip for that kind of thing is to turn the burner down/off while you’re working on it then back up. Just makes life easier.
As for getting the meat off the bones. Once it’s cooked, it’ll just fall off. In fact, that’s one way to know when it’s done. You won’t even really be able to pick it up anymore since it’ll just fall right apart. Stick a fork in it and instead of the entire chicken coming back up, you’ll just get some shredded meat. That’s one of the things that makes crock pot cooking so easy. No worry about temperatures, times etc, the meat either falls apart or it’s not done yet. From there, you can just pull it apart with your hands. You can let it rest for a while if it’s too hot.
Also, one last thing, making your own broth is one thing, but if you just need a roasted chicken for something, honestly, you can’t go wrong with the rotisserie chickens that most grocery stores have. Those ones that are in the deli section, sold hot, usually cooked within the last hour or so. They’re really good, fall off the bone right in your hand tender and perfect for whatever you need them for. When I make chicken soup, for example, I boil my vegetables, in broth, then the noodles and shred one of those while everything is cooking and toss it in. I can have really good chicken soup in about 20 minutes.