Would "working out" with a respiratory muscle training device improve survivability of ARDS in patients without access to a ventilator?

“Acute Respiratory Distress Syndrome” (ARDS) is characterized by a rapid onset of widespread inflammation of the lungs. The causes are many, and one such cause might become prominent in the near future: Novel coronavirus (2019-nCoV). [EDIT: Later became known as: SARS-CoV-2]

ARDS patients are placed on a ventilator to help them breath. Treatment of ARDS has evolved in the last decade to include 1) Lower Tidal Volume (a setting on the ventilator), 2) Paralysis (so the patient can’t override how the ventilator is working), and 3) Prone position (flipping the patient over for most of the day). Even with these measures, the prognosis is not very good.

This question is about survivability of ARDS given no ventilator is available, and if previous training with a respiratory muscle training device (in the months or weeks leading up to the disease) would change survivability of the disease.

Devices that restrict inhaling and exhaling are inexpensive, and can even be improvised. Training with these devices is probably easier than other physical exercise, so if “working out” with one would help, it would seem a small price to pay.

After repeated use of a respiratory muscle training device, one would expect the muscles that move air in and out of the lungs would be stronger.

The question: given no ventilator was available, would this extra strength improve chances of surviving ARDS?