Two more "not quite what you asked for", but may be of interest:
The Romisen RCN3 will take 1 x CR123 (or 16340*) or 2 x AA (NiMh, etc.) with the supplied extension tube.
The Romisen RCA5 will take 1 x CR123 (or 16340*) or 1 x AA (NiMh, etc.) with the supplied extension tube.
*(May, or may not be officially sanctioned by the manufacturer, I'm not sure, but several sources mention it seems OK.)