I've never found a crockpot recipe I like with wild game. They are always dry and stringy, with a lot of juice and gravy to try to make up for the nasty dry ass meat YMMV. I'd take an instapot roast over a crock pot. I instapot neck roasts and they come out really well. Nothing special, just a bay leaf or 3 and a cup of beef broth, plus salt/pepper.
My favorite way is set roast so it comes to room temp. Then coat with your favorite spices, go liberal on the salt, let it sit for 30 min or so. Then sear on high all sides, finish in a 450deg oven to 125deg internal, remove from pan and let rest for 10 min or so. This should put you right in the rare-med-rare range. I cook at about one roast a week like this, and its by far the easiest and preferred method.
Second favorite is liberally coat (slathered) in spiced and salted butter, cook at 450-500 deg oven. Cook to 125 internal. pull out, rest, etc.