Your title is about jigging – so that’s what I’ll focus on.
For jigging, I think the most important thing is having a balanced setup where the handle is maybe just slightly heavier (tip up presentation). So you could certainly vertically jig or pitch jigs with a casting rod.
Since line capacity isn’t going to be a huge driver with this setup (and more line is more weight), I’d look at something with a smaller spool capacity like a Shimano Curado 70 size. If you’d prefer to save some $$$, the Tatula 100 is 6.9oz and the new Daiwa CG80 is only 6.5oz. I’ve fished other Tatulas and the Curado 70. Really like them both and they are both versatile for tossing other light/medium weight lures.
Rod is a bit trickier, might want to pick your reel and line then choose a rod based on how it balances. 7′ may be a bit long, depending on the reel weight and the materials (more guides = heavier tip, flex coat= heavier, etc).