I would use whatever you can get your hands on for now, because an interrupted supply of estradiol is detrimental to both your quality of life and associated with negative health outcomes vs continuous treatment.
However I would schedule a routine appointment with your prescriber, which could take place over the phone, and make them aware that the manufacturers' directions to change twice weekly do not reflect the real world longevity of a plaster on someone active who showers daily.
You could use the analogy of a car manufacturer quoting miles per gallon, which was achieved under pitch perfect test conditions with no doors on, no passengers, no luggage, no spare wheel and only the drivers seat in place. It doesn't reflect real life.
You could also ask if they have ever cut themselves and worn a plaster, and whether after living their normal life, it was still there 3 or 4 days later.
Unless they are either particularly sedentary or have questionable hygiene, they will surely understand your perspective and be happy to increase the quantity prescribed to reflect real world use.