Any or all of those will be plenty for the job. With Queen's D2, and in small blades such as on these traditional pocketknives, the main thing to focus on is maintaining a consistent angle and allowing yourself the patience and time to fully thin & apex the edge. Queen's blades are often thickly-ground at/behind the edge, so it takes a long time to thin it out to get it cutting well. This is also why it's important to maintain a consistent angle, because over the span of many, many, many sharpening passes needed to grind D2, an inconsistent angle on a thickly-ground edge will make for a very rounded-off and BLUNT edge. That's the main obstacle with such blades, in making them sharp. A small(ish) folding knife can be difficult to keep a solid grip on while sharpening over a long span of time, therefore difficult to maintain a steady angle.
The DMT Coarse (325) or the EZE-Lap 'Medium' (I believe that's 400) can work well on such smallish blades in D2. EZE-Lap's diamond is polycrystalline, so it's effectively more aggressive (faster) for it's rated grit size. I don't like using anything coarser on small blades like these, because they'll really tear up & scratch up the blades & edges if technique isn't perfectly stable; makes it harder to refine & finish the edges on them. I often prefer to use a DMT 'Fine' (600) for such tasks, for this reason.
David