Could Germany still invade Norway without cruisers?

Could a Germany focused on submarines rather than cruisers and capital ships still carry out the Norway operation?

Probably not. Without the necessary surface ships, German forces would be constrained in southern Norway and unable to pursue objectives such as Narvik in the same way.

Without cruisers and other supporting ships, Germany probably could not reproduce the historical Norway operation. German forces would struggle to advance beyond southern Norway and could not plausibly reach objectives such as Narvik. Norway's defensible central terrain would make an overland substitute for coastal movement especially difficult. Submarines cannot replace surface forces when an operation demands transport, presence, and sustained support along a coast.