The Cinch (which I am still waiting for in the mail) kind of combines the two, actually. It connects to one strap post plus one tripod screwhole. If your lens has a tripod foot, presumably you could leave one tripod hole free for the tripod, or you could also attach it to most of the detachable tripod plate-thingys.
The site says they are made as orders come in, so it takes 2-3 weeks to ship. Made in the USA, though! That'll skyrocket the "domestically produced content" of my camera up to like 4%, by value. I am also sporting American floormats in my Korean car. BUY AMERICAN!