We do have first world countries conducting RCTs to understand it better. For example, see ACTIV-6 coming out of Duke University: https://clinicaltrials.gov/ct2/show/NCT04885530
ACTIV-6's tagline is "Outpatient Repurposed Drugs" which matches up with your description. There are other ACTIV trials with other focuses: https://www.nih.gov/research-training/medical-research-initi...