You're asking for a 20 to 26 foot pound .22, which certainly can be done, but will also eat a good bit of air with each shot. Can get over 90 shots from a 13CI bottle when set for about 12 foot pounds and about 60 when set for about 16.5 foot pounds, so I'd have to guess your shot count would be something in the 50-45 shot range when jacked up into the 20's.
With a Marauder in .22 and a WBHPA in .22, they'd pretty much over lap uses. While they both could be fed from the same pellet supply, the pellet supply lasts 1/2 as long.
Second thought is this: if you're going to spend the $ for an LW barrel, might consider 5mm or .25.