There's no comparison, sonically, between the 4053's and 4060's. I've recorded rock and roll with the 4060's and they aren't in the same league as the 4023's you have now. The 4006/405x really is one of the best mics made.
Think carefully about how you intend to use them. If you're talking about low profile audience recordings, I don't think you'll do better than the 4023's you have now. Omnis will get you more crowd and room at best.
If you really want the omni sound, I would get one 4053 and one small figure-8 like Schoeps CCM-8 or Neumann KM-120. The figure-8 can be used with either the 4053 or the 4023 in mid-side configuration. Use the 4053 downstage and the 4023 for audience recording. You get a really small, quick setup with stereo width that is adjustable in post. With a stud, shock, and quick release, you can just whip that sucker out of your bag and onto a stand in like two seconds. Easy hand-hold or table mount... Omni sound without the hassles of AB or using a baffle, plus a new even more low profile way to use your 4023.