I have yet to see a payor issue separate payment for 99072, so it might be a moot point. However, I don't think it's wrong or unethical to bill it.
I would not have an issue using 99072 in your scenario. 99072 is not for only the supplies (as opposed to 99070). It was intended to also capture additional work being done by staff.
99072 Additional supplies, materials, and clinical staff time over and above those usually included in an office visit or other non-facility service(s), when performed during a Public Health Emergency as defined by law, due to respiratory-transmitted infectious disease
For example, if your nurse spends an additional 2 hours per day asking Covid screening questions over the phone and when the patient arrives, then to me that clearly is over and above what is usually included. The AMA used 3 surgical masks as an example.
If in your practice, your supplies, materials, and clinical staff time is only 2 additional minutes per patient and $1 of supplies, then just charge a small fee ($10).
Some practices are having an additional clinical staff member at the front door to do screenings/temperature checks. Maybe you are having patients wait in their cars, and have to spend additional time explaining that to every patient. Maybe some of your patients come in without a mask and you need to supply one. Maybe you went from spending $25 per year on Purell to $25 per week. Maybe you had a patient with recent exposure or symptoms and everyone needs to fully gown/mask up. Think about all the additional minute here and there, and all the pennies here and there; it does add up.
Every practice should be incurring additional expenses during the PHE. Depending on your practice, it could be negligible or significant, so your fee should reflect that accordingly.