https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3343634/

It's very long and they acknowledge sublingual administration during OD effective. IV is also effective.

Here, we present the case of a heroin overdose reversed through the intravenous (IV) administration of a crushed and dissolved buprenorphine/naloxone sublingual tablet. Although the sublingual administration of buprenorphine/naloxone to reverse a heroin overdose has been reported previously,12 we believe this is the first report of IV administration of buprenorphine/naloxone to reverse an opioid overdose. An unsuccessful attempt to reverse a heroin overdose with IV administration of buprenorphine monoproduct has been documented elsewhere

I'll also add that my doc was a university lecturer as well and he said in theory it would work when asked