I have a D750 (probably not what you want to buy but similar to the D610). I usually carry my D750 with just a 50 f/1.4 to kids parties because a lot of parents get nervous when I pull out the D750 with battery grip and a 70-200 f/2.8. You can get a fairly small bag for a D610 size camera with a prime, in fact the one I use for my D750 and 50mm is actually for a mirrorless camera.

The D610 with a decent prime will have a minimal weight premium over a mirrorless camera and the flexibility to add heavier lenses when you need them.