I also play Boom Beach and LOVE the Dr Terror challenges that hit twice a week for 24 hours. It gives me the opportunity to set aside some time to raid consecutive times to pile up RSS and GOLD for a BIG upgrade and research.
Something similar could be done with something like a renewable goblin road that comes to CoC once or twice a week.
Since getting to TH 9 in CoC it is almost impossible for me to save up to keep upgrading defenses that cost 4.32 to 7M gold each to upgrade. I dropped trophies and farm but still get hit by other players who dropped trophies and they raid my gold. This would make the game fun again for me.
The idea is NOT to merge the two games but is to replicate a successful idea from BOOM BEACH and bring it to CoC in CoC terms. There is already a goblin road. They could expand on this by having a new Goblin Road challenge starting on Wednesday and or Sunday evenings so as not to conflict with Boom Beach.
I like the idea but instead of refreshing the goblin road as it currently exists, have the random element of Dr Terror implemented. Maybe have a wall layout TH and storages be the same so SC doesn't need to design bases every week, but the defensive towers are randomly chosen and randomly placed.
To encourage players to commit, make it so the base needs to be 3 starred to advance to the next base.
Like the current goblin road, attacking it will not break your shield.