I really don't think i could fit a u-shaped dinette in the area. The table with 2 benches idea is going to work out best. Ive also considered building it back to factory.
SVD, from what I can see from your photos, if there's not enough room for a U-shape, it doesn't look like you'll have enough space.
Even making the seats higher, I'd suspect that the curvature of the hull will remove most, if not all, of the leg-room from the person against the hull (though okay for small kids I suppose) and the table will take up quite a bit of valuable storage space, although if it can be lowered, you'd have a double berth.
The reason pilot berths are fitted as standard in most small boats is because they maximise the available seating & storage space, given the curvature of the hull. U-shaped dinettes work great, but you need plenty of beam to have a seat against the hull and seating for two between that and the centerline...
.. but with that in mind, seeing as you're going to replace the bulkhead anyway, could you move your fore/aft passageway further to starboard?? It's a bigger job, but a U-shaped dinette might fit then.
Just my .05 cents worth...