Aftermarket hoops will fit, but they won't correct the problem, which is a mathematical lug to shell oversight.
That's not necessarily true. I had splay issues with one (non-Ludwig) snare when I put S-hoops on it, but had no issues with a set of 3mm triple-flanged hoops.
Honestly, I wouldn't worry about the splay at all unless you've got a drum with tube lugs, where the splay can cause the tension rods to bind in the lugs. And even then, snares are the only drums that have enough tension in the t-rods for splay to matter.