It can be done! I spent 2 weeks trying to trap a big old boar using corn. He would root around the trap but not go in. Finally, out of frustration, I swithched to breakfast scraps from a diner. Grits, eggs, fried bacon, etc. Caught him that very night. 350lbs, 4 inch cutters. Took 4 men to lift one end of the trap and run him into a stock trailer. Tied him down & castrated him, fed him on corn for 4 months and he ate as good as any domestic hog I ever butchered. I always use scraps for bait since then.
And yes; sows in heat WILL attract wild hogs. It happens around my place whenever I have one in the feed pen. I've gone out to feed up and had more hogs than the day before. As soon as they cool down and get free groceries they tend to tame down a lot, but never turn your back on a previously wild hog.