I would just use a hoop if you haven't found a frame that suits you. I always suggest the
Millenium Frame as it is my all time favorite frame, but it doesn't fit within everyone's budget and it does take time to get made and sent to you.
Hoops are actually easy on big projects, you just need to be sure you never leave the project in the hoop for too long. Hoops are great because they're easy to set up so you can (and should) just take the hoop off anytime you won't be stitching for a few hours. I suggest wrapping your hoop in a light coloured/neutral fabric so that the wood won't attack your stitches. If you're still uncertain about it, just place an additional piece of fabric over the project where it will be clamped in the hoop. You should still be able to pull the project tight in the hoop, and it will protect your stitches.
You don't even need a large hoop. Because you really have to take it out of the hoop everytime you're not stitching on it, you can just use a standard/small hoop and work within it and then move it along when that section is done. The only issue you'll find is that your extra fabric will be something you will need to manage. I usually roll it up to keep what's been done safe and that way it isn't flopping around getting in your way. You can even roll the fabric in multiple directions if you're working near the center of a piece to keep the bulk down.
Edited to add: I wouldn't use a hoop where it has a lip- like
this one. It pushes the fabric in multiple directions so it is more likely to warp your stitches at that juncture. Standard wooden hoops are best imo, but anything where its just two circles nestled is fine.
