That's currently what I'm working on at the moment. I've found that doing the stun/alch method will actually generate upwards of 150k +/hour if you're paying attention, and from what I've researched and experimented with; this method is probably my best route.
Occasionally, when I get bored I take a trip over to Brimhaven's Metal Dragons and fire wave/alch for a while. Doing this I've gotten close to 90k/hour and make profit too as they drop rune items frequently.. along with the occasional dragon legs and skirt