I’ve never been in a collar as you describe. However I am always, constantly, doing modifications on things because many of my family members have various disabilities.
I think at first you will be in pain and probably will just want to rest. Once you are able, where there is a will there is a way. You will figure it out once you get there. Is it a laptop? Did you know you can attach a usb keyboard to a laptop? You can perhaps raise the thing to eye level on a box, stack of books, so you don’t have to look down as far. You can attach the usb keyboard and set it on an angle propping a rolled up towel under the top half, so you can see the keys better. If you have to, hold a pencil and peck with it. I don’t know if any of none of these “modifications” will help you. But life for disabled people is all about finding ways to modify things to make them work. If you have to raise or lower the keyboard level, you might use a folding tv tray table or some other creative way to change the height. If you have to enlarge the font on the monitor so you dont have to lean close to it to read it, there are ways to blow up the font on most browsers. (In firefox it is view: zoom).
I’m not sure if you use a desktop PC, or a laptop. I have seen people bedridden who had a table set up next to their bed when they couldn’t sit up. All I can say is, depending on your pain, flexibility, angle of vision, you will just have to make modifications accordingly. You will probably be fine. However if you need to alter things a bit, you’re a smart guy. You will find a way to modify things accordingly. I think having the monitor closer to eye level or meeting the angle of your vision with your head fixed will be the key. That might mean finding a way to raise it to your eye level or tilting it.