I have hardwoods in the kitchen and also in my master bath. When I was researching about putting them in the bath (worried about water issues), I was convinced by people on some forums here, that regardless of the flooring, if you have a serious leak or flooding, it's going to ruin whatever floor you have. Or at least it's going to have to be pulled out in order to avoid mold and underlayment issues. So, I wouldn't have any worries about using wood in your kitchen, esp site finished oak. It will stand up to anything, barring a serious leak or flood. I understand your desire for a dark floor "However, the kitchen look that I love is a marble type quartz countertop, with a dark brown floor" but since you are expecting to sell soon, I would think a cohesive, coordinated floor throughout the house, will appeal to more people than the look you want (when it's so different from the rest of the house). Maybe you can make your preferred look, the look you want for this kitchen, your goal for the house you'll be buying to replace this one?

THis is just a summer cottage, no insulation, heat, etc. it was built by a farmer for my parents 50 + years ago. The pine floors aren’t even tongue & groove, just very irregular boards, and I have no interest whatsoever in the time or expense of refinishing them. The vinyl plank is purchased; my only question is about the type of thrasition to orde.

Sorry but vinyl does not receive under pad. It is different from laminate. If it were me I would take the vinyl back and purchase 12mm laminate and 6mm cork underlay. Problem fixed. The 12mm = 1/2" + 6mm = 1/4" = 1 8mm = 3/4" . At this point you can use a regular transition strip.

@Liz H we have updated all the lightbulbs/fixtures in the kitchen and will be doing the dining room this weekend so that will help. I think Agreeable Grey has a little too much brown in it for the countertops. I think i have to stay pretty grey unfortunately whereas I want the rest of the house to be more greige. Thanks for the suggestion!