You want a quick release sling for this type of sling.
https://www.amazon.com/s?k=blue+for...mp;tag=mh0b-20&ref=pd_sl_b6mse7g8q_b or this is another.
https://www.vikingtactics.com/category-s/1833.htmSlings are a very important tool, for climbing walls or climbing deer stands, dragging a wounded person or a deer and can also for use as a tourniquet. You can go on YouTube to learn about these two slings. Both developed by Delta Force Operators.
In addition to the above, I would highly recommend to learn how to use a tourniquet and use rubber bands to secure to your stock, so it always with you.
I would just try to find a local tactical gun store for the quick connects and put them on while you are there, although I would stick to one of the above for a sling and bring it with you to the gun store.