Very cheap, easy, and pretty high quality solution (or at least not ghetto):
Get an Atlas TB-58X extension tube ($9 at markertek.com), an Atlas AD-5B 5/8" female to female coupler ($4.50), and a clamp if you don't have it, like the TecNec clamp MPC-10 ($16 from markertek). Less than $30 in parts.
Set up your stand, use the AD-5B coupler to attach the clamp to your stand, 5/8" stud of the stand to the 5/8" stud of the clamp (the AD-5B holds them together). You've now got a stand with a clamp on top, but unlike the usual way of clamping, you now have the clamping "mouth" available. Put the TB-58X extension tube into the clamp (set-up in the middle of the tube) and tighten the clamp down. You've now effectively got a very large t-bar on top of your stand, and there are 5/8" threadings on both sides to accept mics. The extension bar is only 31", but once you add mic clips or shockmounts, you'll get a 3' spread.