Mobility sustain item?

So I was just wanting to throw this out there as an item idea. I had a thought of an item where you essentially use yourmobility to regain health. The items that build from Kircheis's Shard, including Kircheis's Shard, Runic Echos, and Luden's Echo are the only items I can think of that really provide effects based on how far you have moved as a champion. There are some champions that have similar parts to their kit. In fact, Kindred's passive on her W is almost exactly what I'm looking for. The only thing I'm thinking that I would like to see differently (if possible) would be to not grant health upon landing an auto attack after reaching full stacks. Instead, I would want to see it simply grant health at 100, and reset. I do understand that this would make the item stronger, but I would want this to be a good item on roamers. You can of course always just attack a jungle camp, as Kindred does, but I'd like it to be different. I don't know what stats would work best, what other item it would be built from, cost, scaling, numbers, blah blah,... at this point I'm looking for impressions, interest, and ideas.