On stage (or stage lip) + SBD is certainly worth trying. It depends on how big the stage is, but it will probably work well most of the time, with occasional imbalances.
Usually when I run stage lip I get plenty of bass and electric guitar cabs, more than enough snare, toms, cymbals, high hat, and a nice wide sense of space. If the organ has a leslie, you'll probably get a nice shot of that. What you won't get is enough vocals (unless you happen to be picking it up from on stage monitors), not enough kick drum thump, and nothing from direct instruments... guitars on DI, keys, etc... you won't get any of that.
Interestingly enough, a lot of the SBD feeds I get are all kick drum, vocals, and keys, so it balances out. Occasionally it won't balance out. That's the luck of the draw sometimes.
As page says, if you are just a few feet from the drums, and the drummer is an animal, they will be overpowering. If you can get back from the drums a little, it's not too bad. I would try the 414 subcards in kind of a NOS setup. If it's really thumpy music, go for cards instead, or it could be muddy (been there, done that, with those particular 414's).
Mid/side is one of those things everyone should try a few times. It's a good learning experience and perhaps even a right of passage to battle your way through the software to find your preferred way of doing it. If you have too much drums in the middle, you can cut back on the mid. If you have too much reverberation on walls, you can cut back on the sides. But, it's not going to make gold out of lead.
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If you can clamp to the pole, get a set of long XLR cables and run them down the pole, across the floor to your bag, or run them overhead if there is something to clip to. I do both fairly often. If you run across the floor, tape them down to the floor so no one can trip on the cables. Don't use exotic thin silver clad cables across the floor where people are stepping on them. Go to the local music store and get some "on stage" grade mic cables for that. I have a $50 pair of Monster cables I've been using like that for a few years. No breakage yet.