I would be very hesitant to go that heavy on neem
It easitly suffocates plants
I've done it before lol.
With roses, there are 2 solutions:
-Destroy plant
-Take buds and bud onto a healthy rootstock, or perform micropropagation, and hope to hell that the virus had not spread to the new tissue yet, and then destroy the original host plant
In your case, the symptoms showing in new growth is not a good sign, becasue it means you can't get virus-free clones.