I'd never heard of a Karran sink before. I've learned so much here! I thought it might be hard to clean, since it's fiberglass, but the description on their website doesn't make it sound that way. I thought, from looking at the FKB, that you had Corian counter tops, but I guess note. What brand of laminate do you have? Is it the regular, thinner laminate. That's great they could do that. I looked at your pictures and it looks good to me. Is there some kind of edging applied where the laminate is cut for the sink? I was looking at the thicker laminates, in part, because I thought that they couldn't put an undermount sink in with the regular laminate. Obviously, that's not entirely true. Now I need to go do a Google search and find out what Counter-Seal is and how it works.

I opted for a Karran sink but I saw a counterseal sink/counter on display - it looked pretty good but how it holds up longer term I don't know. I've had the Karran sink for a little over a year at my weekend lake place. No problems so far. Things to consider in my opinion. I'm careful about the edge where the laminate meets the sink - it seems like this might chip easily. The Karran sink does stain easily though it does clean up easily too with softscrub. It's the kind of sink you need to clean frequently though. Here's a picture of mine.

I recently stayed at an airbnb on a small island that had a wooden countertop with an undermounted sink. It was a little cottage that had been built in the 1920s. The owner said he hadn't done anything to the counter when he bought the cottage 6 years earlier or since, except replace a small section of countertop where the old hand pump had been before electricity had come to the island. It was edge-joined cypress (face up). It looked heavily varnished but the wood was in great shape and looked fantastic after 100 years. In no way would I shy away from an undermount sink with butcher block if I was willing to invest a little care. It's a beautiful look. I'm trying to figure out a way to install an undermount sink in one of the new IKEA "butcherblock" countertops, which are really only a thin layer of wood on an MDF core. The laminate-friendly sinks from KARRAN look promising, but they're made to mount flush into an MDF surface which then has laminate installed over the sink and trimmed away. I have to work out a way to rout out the MDF from underneath and leave only the solid wood over the sink and make sure it all gets sealed up. I haven't seen anyone on the internet do this, so I might be venturing out on my own.

The answer is no, you can't make that not look weird. The solution is to replace the countertop and then tile it. Remove the existing countertop and cut plywood. Then apply thin tile backer and tile. That way you can install the drop in sink that you need. It's still cheap and doable by DIY'er until you can have it professionally done. BTW: I did this with 24x24 granite tile and it looked great when it was done.