You may be onto something here. If
@Doug118 has the ability to C-notch his frame, then he has the ability to cut and weld. Without actually looking at it, I'd guess the Spohn panhard could be shortened at least 1.5" if you were to remove the jamb nuts and thread the two halves all the way to the center. Or, if you need to maintain some shortening adjustability, cut the threaded tube adapter off of one half, chop ~2" off of the tube and weld the adapter back in. You could shorten the panhard bar, cut off the frame side panhard mount, set the vehicle up at ride height with the axle centered, bolt the mount to the shortened panhard and see where it falls out in relation to the sway bar and how it could be reattached. This MAY allow straight end links. They'll still have to be much shorter than stock, but this is easier to achieve than an offset link. For the engineers reading this: Yes, changing the mounting point and length of the panhard would alter the arc of it's swing, and could induce body sway much like how poorly-designed front suspension components induce bumpsteer. I don't see how it would be a problem here. It's the rear and you're not articulating your suspension much at all with a 7" drop.
Another idea: Again, I'm not looking at it at the moment, but instead of cutting the panhard mount completely off, it may could be pie cut and bent inboard that ~1.5" and rewelded. This would be really easy since it's just a few slices with a cut-off disc, a few whacks with a hammer and a couple of welds. It'd move the mounting location to the left as well as upward, flattening the panhard bar's angle. It'd a very small amount upward, but still a positive gain. Cutting the mount completely off from it's original location would let you relocate it much higher so that the bar is as flat as possible at the lowered height.