Can you show me a photo so I can see what your looking at?

I think a larger black tone lantern would look great. You have only a single light box.. I wouldn't do three. I would personally do one or two decent size lanterns left and right. The size and width of the island would need to be known if you are hanging multiples. Many different lanterns out there in black. I favor the Darlana by Visual Comforts. It's very well made and has more straight lines than the mock up above. The iron on the one above across the top each piece is slightly rounded. This is Darlana however obviously showing in the gold tone. It's available in dark, gold and silver tone. With a lantern the ceilings will need to be fairly high.

IMO forget any light fixture in a kitchen that uses Edison bulbs. All lighting in a kitchen should provide good lighting so look for something in an LED fixture with 4000K bulbs I have no idea of the size of the island but usually 3 pendants ate the norm and If all you want is a linear one it will need to have either the electrical at one end or you need a new electrical box in the center of the 2 old ones. Maybe look at a track type light where the electrical can be anywhere and then choose the pendants you like to hang from it at the proper spacing

Looking for pendant light used in the Centennial Home French Country Home and Living Magazine that just came out(Sept. 2021) page 74. Your company was listed in their resource guide for the light pendant. I would like to purchase!