Bone broth - my first attempt

Does it work to use a strawbale cooker/EZ bake coffin/Wonderbag instead of a crockpot/pressure cooker/instapot to keep temperatures close to boiling?

I'm sure my grandmother made bone broth when I was younger. But I don't remember ever learning how to make it myself.  A dear friend made some a few years ago and I loved it. She used chicken. Now I make it year round. I buy a rotisserie chicken, bake it, eat it up for a dinner. Take all the leftovers & add my favorite veggies I have on hand, onion, & seasonings. Cook overnight plus several hours the next day.  

Often I use my crockpot, especially in the colder months.  I put it in mason jars, put in fridge. It never lasts long, as I use it for everything, even as a hot drink when I can't shake a chill or a cold or illness.  I make it at least once a month, usually more often. It really is worth the time & effort. --Tess