Any brine will bring some liquid out of the meat before osmosis carries liquid back into the meat. My experience with boar is if it tastes terrible before brine it’ll taste terrible after. Masking is probably more accurate than purging.
If you have a large cut it will take much more than 24 hours to penetrate. The lump of meat also has a sectional density. Think of a roast as a 500 grain 45. A simple salt/sugar brine will work but you may want to use some Instacure #1 to ensure safety during the 4-5 days it usually takes. This will also impart a “hammy” flavor.
A recipe for corned beef will work well for calculating how much Instacure to use. Just substitute pork-appropriate spices like juniper and rosemary.
Be sure to discard the brine from the boar. While corned beef brine is ok to use as a braising liquid, the boars liquid will be pretty pungent.
Baking soda will tenderize and neutralize some bad flavors but will do nothing to a large dense cut. It will not penetrate unless you soak for a very long time. This would turn the whole thing to mush and risk a soapy baking soda flavor. Judicious use of baking soda on thin cuts can be useful but I would exercise caution. Try a small batch first.
In your thread,....I have to ask....Are you trying to get rid of the "gamey " taste associated with "trophy " size hogs? vs meat hogs?.....
TRY THIS:
Regardless of domestic or wild meat...
If the animal is "aired", hung", allowed to "naturally" age for 4-7 days prior to.... then soaked....in a salt water brine (changed every 12 to 24 hours) to remove as much blood as possible...then finished butchering...before cooking or put into the freezer for later use....Then marinades for 1 to 3 days....the meat will be tender and delicious after cooking. Regardless of how cooked.....slow cooker, grill, fried, baked/broiled.
Wild Game is not beef, (domestic) pork, or (domestic) chicken!!.........IT'S NOT GAMEY....IT Just taste different!!! BECAUSE IT IS!!!...
That's not to say circumstances like..rut, age, feed, etc, doesn't influence the taste. IT DOES!!!...But that is the reason we add flavor and spices to any food is to make it more tasty.....Isnt it?....
And YES, the thicker the meat the longer it needs to be marinated....to allow the marinade to fully penetrate the meat.
NOTE:
The more fat removed from the animal during butchering the better the taste later!
Cleaning/cleanliness of the animal is another great factor.....proper and timely removal of scent glands, internals (guts),...washing/hosing away blood and hair..... during and after gutting and skinning.
Rigormortous.....the longer an animal can hang (in whole) to allow the natural process of rigormortous to dissipate will also help improve taste and tenderness.
Of course:
Last (or for some...first or/and only) resort is sausage and burger.....all the meat....(IMO What a waste..(of good steaks, ribs, roasts, etc)....
Just wanted to put out more info on how to improve the taste and quality of wild game meat.