Mr_Rogers
First, I would personally have no problem with you capping a dirtball intruder who breaks into your house. But there is the problem of after-action review.
Insofar as your question about going outside & coming back at a burglar, it may be tactically wise, but could be construed by a prosecutor/jury as intentionally entrapping him.
A prosecutor (or litigation attorney attempting to get easy money for Mamma Dirtball & Baby Dirtballs) would advance the theory that you intentionally climbed out to the roof, and broke into your own home with the intention of cornering the intruder and leaving him with no means of escape so that you could shoot him (even if there is a back door, he'll claim that the burglar had no way of knowing that).
Not wanting to see you get your legs taken out while coming down the stairs, what should you do?
I don't know how much climbing is involved with your "Plan A". It would be a shame to be attempting to stop a burglary, fall, break your back, then have the burglar hurt you or your wife while you're laying there like a turtle on his back.
IF you are going to confront (and possibly shoot) a burglar, one of the wisest things that you can do is to have an inexpensive digital recorder handy. (They start on eBay for $28.00). It should have at least 15 or 20 minutes of recording time, and be capable of being downloaded onto a computer and disk. Start recording as soon as you have armed yourself.
Then before you start shooting, order the offender to stop, beg the offender to stop, plead with him to lie down, to stop resisting, to put down the fireplace poker, or whatever. If you have to shoot, continue to plead with the burglar to stop, even while you're shooting. Then after the fact, make a sorrowful noise and ask why he made you do that.
Then when the investigators arrive, make certain that you and your attorney each have a copy of the recording before you surrender the device.
Criminals say stupid things such as "I'm going to kill you. I'm going to f... you up." Such a recording can highly bolster your case.
Why do you think that police departments have invested all that money in dash-cams? One successful lawsuit can pay for the cameras for the entire fleet.
And since you know that it is being recorded, and that it is going to be listened to again, you can say the proper things.