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Almost all my dedicated and non-dedicated QR plates/L-brackets have a 1/4" threaded hole for attaching accessories or mounting on non-arca heads: Sunwayfoto, Kirk, RRS, Camadapter, ProMedia, etc. Some even have two. Save for really tiny plates for P&S or M4/3, it's hard to buy an Arca plate without a 1/4" threaded hole. Most of them also have a hand strap loop.
If you swap back and forth between a strap and tripod a lot, the threaded connector is a PITA. A small Arca clamp (25mm) is faster and more convenient. I haven't tried one, but a new Kickstart project, Fusion, has a neat looking non-dedicated plate with fold out clip for BlackRapid: