Sunny sure is a beautiful pup.
We have a 3.5-month-old pup, Brody! Brody is our second Golden. At first, Brody barked and wined a good bit when first going into his crate. Just as a small child usually cries, or shows dislike when it's bedtime, they will eventually settle down an go to sleep when they realize it's bedtime. From our experience with our three sons when they were younger and now, Brody, kids, and puppies have to learn to adjust to your schedule.
Otherwise, you'll be doing as you are now, camping in the living room with your pup.
Yes, Sunny will bark if you leave the room, but let him bark. As long as you're confident he doesn't need to go outside and that he isn't hungry, let him bark until he settles down. For us, Brody doesn't bark or wine any longer when going into his crate. I once saw on a post about crate training to not make a big deal out of putting a pup in the crate or when letting them out. Likewise, when I walk past Brody's crate, I never make eye contact and I don't say anything to get his attention.
It sounds like you're adjusting to Sunny more than he is adjusting to you. Sunny has learned that if he barks he will get your attention, so why wouldn't he bark??? Now that this behavior has become the way for getting your attention it's going to be more challenging to break, but it's doable.
We never placed the crate in our bedroom. We placed the crate just outside our bedroom in a hallway. Brody can't see us from his crate, but he is close enough.
You mentioned that Sunny can't be trusted at night because he is a chewer. So, when does Sunny sleep? Once again, I suspect you're adjusting to Sunny's schedule vs. Sunny adjusting to yours. All pups are chewers at this age.
We have been using dried pig ears, and more recently we purchase beef bone shanks that are full of bone marrow. Pigs ears are tough, and I think better than rawhides. They don't tear easily, nor is Brody able to break off huge chunks that could be a choking or digestive concern. It usually takes him roughly 24 hours to go through one. In the process, he tires himself out and sleeps like a rock. The bone shanks are healthy and good as well. Bone shanks don't splinter, and Brody can chew on one for days... I get bone shanks that are big enough that he can't swallow either. You may want to give this a try.
Lastly, try playing with him before bedtime to tire him out. Play a gentle means of tug of war, or have him fetch a ball. Brody likes both, and these activities tire him out after maybe 15-20 minutes at this age. As you're probably aware, once Sunny gets older, it will take more activity to tire him out. Just this past week I took Brody for his first walk downtown as the temps finally became more suitable for this activity. We socialized with people and other dogs. We took our walk in the late afternoon. Brody was worn out by the time we got home. He slept most of the evening and easily went to bed at bedtime.
It takes a little bit of creative thought and planning, but work or getting Sunny to adjust to your schedule by doing things with him when the time is right for you. In the process, try to anticipate how your activity with Sunny will create the desired results you want. Make sense?
Hope this was helpful...Keep us posted on your progress.