Those Jack Russells will surprise a lot of folks with the degree of 'hunt' they possess. Once knew a fellow that used several to hunt wild hogs on a mostly deer lease I shared a membership in. He ignored deer generally, but hunted pigs nearly year round with those terriers with remarkable success and used a .22 rifle exclusively, if you heard the racket those little dogs made it was shortly followed by rarely more than one shot.............lotta pork chops!
Even more surprisingly, the injury level sustained by those little dogs was nearly non existent compared to the damage those porkers would inflict on our walker deer dogs when they bayed one up! Saw more than one walker or pit bull have to have his guts shoved back into his intestinal cavity and sewn up with mono!.......Another old fellow that hunted on that property used his exclusively as squirrel dogs....worked well.
Super trainable & intelligent as all get out.........your idea'l work!~
T