Depends on what you mean by pocketable. I don’t think even a low CRI 6500k XHP70.3 will sustain 1000 lumens in a host small enough to be jeans pocketable (I’m thinking 1x18650 sized hosts here). There’s not enough surface area on the host to dissipate the heat.
If you beef the size of the host up a bit, like an SC700D, E12R or D4SV2 with boost driver, you’ll be able to get 900-1000 sustained lumens for multiple hours.
Small Jacket Pocketable sodacan style lights like the TC20 v2 can definitely do it as well. If you’re looking for something a little more throwy, the K30GT can sustain even 2000 lumens for over an hour, and throw 100kcd to boot. It can also fit into a jacket pocket.