In my experience, the R/NPH regimen poses way to many challenge to effectively manage type 1D. NPH is one of the most un predictable insulin in use. It cannot provide the necessary basal insulin during the 24 hour day; therefore, your I:C ration will vary throughout the day. Any factor that can impact BGs will be exemplified and unpredictable. It can be done. But when you weigh the cost of insulins used in currently recommended regimes using long and rapid insulins against the money saved by using R/NPH, it’s not worth the risk and stress of not controlling BGs and life limits (freedom).
Personally, with tens of years using each; the pump, NPH, R/NPH, R/ultralente, and other variations, my choice is a pump or MDI using a rapid (apidra, novolog) and long acting insulin (lantus/levemir split into two am/pm shots).
And, if this was the docs recommendation for treatment, drop the MD w/o looking back and find another Endo MD.
It’s all a challenge and in the end, what works fo you is the best!