This is just a rough idea and I was limited by the number of Maps waypoints but starting from somewhere like Kiel it would take in Germany, Poland, Russia (?!), Lithuania, Latvia, Estonia, Russia (again), Finland, Sweden, Denmark and back to Germany.
Here's the twist. The entire idea is to stick to the coast, so the rally/race/whatever would be based around proximity to the coast as well as speed. Essentially multipliers depending on the proximity, points eventually meaning time deductions. You could waste your time on coastal roads but the extra points you rack up could deduct more time that it takes to drive that route. Kaliningrad has a tiny road that goes up a thin stretch of land but is a dead end, good for points but it might not be worth it. I looked on Street View and I was also creeped out by the place. Avoiding it would cost dear in points but maybe not in body-cavity searches.
That brings me to two other things. Firstly, no ferries would be allowed. Since the whole coastal thing would be calculated by GPS, it would be obvious if a ferry was used. Secondly, that island with the marker thinks it's Iceland and has a road that essentially goes around the coast. Joined to the Swedish mainland by a bridge, a lap of it would be part of the route. I found a pub on Street View that has mini golf along with a windmill and a helicopter in the yard. Yep.
The oddest thing is that on Street View, most of the coastal roads I've looked at are lined with forest and you simply can't see the... sea. Even while driving right along the coast to Kolka, Latvia. St. Petersburg has a massive points-scoring feature of a motorway bridge that goes out to sea before diving under it. Lots of the roads look very Autopilot friendly too, if I could borrow a fusion reactor I could do it without stopping...
Certainly if someone makes a world driving sim I'd do this, whether or not it's doable in the real world can be decided when roadtrips are actually possible again.