While the Eureka Jack isn't a "large" knife, the Conductor will be much more pocketable, even if you get the 3 blade whittler model over the 2 blade. The EJ is broader, and has 1 thicker spring and one thinner spring, with a liner inbetween. The 3 blade Conductor whittler has 2 springs; each secondary blade rides on its own spring, split by a "wedge", which taper towards the other end, where the clip blade rids on both springs. The 2 blade Conductor rids on a single spring that is thinner than the combined 2 springs of the whittler. The 3 blade Conductor should be fairly comparable in size to your Queen 26, and the 2 blade will be slimmer and lighter. The Eureka Jack will be larger and heavier, but not massive. For slacks, and "slim, easy to carry", the 2 blade Conductor fits the bill the best (I went with the buffalo horn once since it has a coping instead of a pen blade, and no bail).
Sorry, I can't give you the picture you're looking for, as I only have the 2 Conductors (my other being a whittler in ebony), but no Eureka Jack. An ivory bone EJ is at the top of my list for my next knife to get.
Another, similar knife too look for is the Schatt and Morgan 042155 half whittler. Sometimes it's referred to as a "serpentine moose", but that's due to an error in their catalog. It has a 3.5" frame, and very thin california clip and coping blades. Makes a great "weekend" knife. It also wouldn't hurt to look into certain half congresses, if you don't mind the reversal of blades (sheepsfoot master, pen secondary). Vintage Case 62052 half congresses are extremely slender, light, and pocketable. And by "vintage", I mean the single spring ones, not the newer 2 spring ones. GEC's half-congresses are a bit more robust and thicker, but also nice.
