You are just repeating what I had said... the States are empowered over such decisions. There is nothing preventing a State from temporary replacing its own incapacitated representatives in the senate, either until next election or until the current office holder can return.
A senator serve the State in its political capacity, not himself, the 17th never changed anything in those regards, i.e., the Senators are still representatives of the State, and House representatives the people directly. There is nothing that can prevent a State from having provisions in its laws for temporary filling a vacant seat due to an incapacitated senator.
Yup, I disunderstood your original reply. Sorry. We are surely on the same page.