I would highly recommend redesigning the ceiling fixtures, rather than working around what's already there. It's cluttered and lopsided; and you will probably regret it, or spend much more $ fixing it afterwards. I'm 1/2 way through my kitchen project with a large island hub. To make space for the pendants, I removed two round fluoro's, moved an A/C outlet (and another in the adjacent room with a sky-light), then patched and painted. It's all simple stuff, you just have to design around the ceiling joists, and usually the previous cut-outs are left in the roof (makes it easy to patch). I also installed an electronic sky-light from Bunnings for the in-laws, which is perfect for small roof-space issues. A very small PV panel goes on the north-side of the roof, a slim LED panel goes in the kitchen ceiling, and a long power cable links the two.

Looking at your lighting plan, it isn't not enough lights, it is where they are positioned. The three lights above island should be spaced directly above island for task lighting. Your plan has them across the kitchen, the same as other three in the middle of the kitchen. If you look at the photos that have been posted with pendant lights, they are all positioned over the island bench, not spread over ceiling. Hope your choice of lighting works well.

Just a few questions; Will you also be having downlights in your kitchen? If you are, then your pendants need only be "decorative", rather than functional. If you're not, then you will want to be sure they are functional primarily for the space. Bear in mind that "Metal" shades create a focused light downwards and do not provide ambient light. I have attached a selection of chrome pendants from one of our suppliers that could suit your space beautifully. What do you think?

I like option 1 too, if you are worried about them not being big enough, can you find something like that, but that is bigger than the 16cm? Also, you could go three, I'm posting our former kitchen reno for you, the bench length is 1600 and our pendants were probably around a similar diameter, possibly slighly bigger, and given how heavy ours were in comparison to what you have chosen I definitely think you could get away with three if you liked the look better.