Indeed, the only logical thing for a player to use is a LAC, most likely indeed one of the Shrike classes. And even then, graser range is measured in hundreds of kilometers or more. Generally, even close up sneak attacks (Think the battle of Cerberus, Honor going in balistic and grasering the Peeps) are near a light-second apart. (The exact range in the book, IIRC).
I'd love to see a proper Honorverse game, but it's impossible to do true to the books without going back to something with very little graphics but a bridge display, and perhaps a few visuals for extreme telescopic view.
Under impeller drive, the cap ships are often over a hundred kilometers away from eachother, so even then you wouldn't see much.