I think the Via Michelin route planner could do that, set a marker every X kilometers or even find the nearest overnight spot.

Important thing to know about going to Nordkapp: riding in Finland and Sweden is fast and easy, riding in Norway is slow (and beautiful). If you start from the Netherlands, well, the easy way is to ride via Germany up to the tip of the Danish peninsula, ferry Fredrikshavn-Gothenburg, and then follow the E45 all the way to the top of Sweden. Easy, fast, safe, a little bit boring (but not as boring or annoying as the coastal main roads). It's a little over 1600 km, and yes you can actually do it in two very long riding-days.

From the Swedish-Finnish-Norwegian border, you can get to Honnigsvag (the village by Nordkapp) in a day. Arrive in time to check in at the Vandrerhjem (cheapest option if you don't want to camp), then ride up to Nordkapp early the next morning - if you get there before the ticket-checkers, the gates are open and you don't have to pay the entry fee. Look around, take your pictures, by the same evening you can be in Tromso (a bit risky, maybe stay in Alta instead as a relaxing ride) or back in Sweden.

Riding in Norway is much slower than Finland or Norway. Roads are twisty, speed limits are low, more traffic is squeezed onto fewer main roads. But it's much more rewarding, too. Stay off E-roads there, stick to local Rv roads, especially anything marked as a Norwegian Tourist Road (google it).

Consider that Teapot One was intentionally going as fast as he could, his point was to go around the world quickly. If you are having a holiday and enjoying it, maybe plan on 300-400 km days max - this lets you start early, get to your next destination in the afternoon, find your accommodation and enjoy the scenery (or have time to stop at places and walk around during the day).