I had this earlier this month... College kid passed out in his car, Dorm Security found him outside the front door at 4am and couldn't wake him up. We got called for the unresponsive subject.
The university first response EMS was onscene and hemming and hawing... I recalled the ALS, as Pt. was CAOx4 with no medical history, and only had "a few" drinks. He said he was a sound sleeper, and that's why he didn't wake up when the security officer knocked on the window. He was woken up by University EMS and PD, and was CAOx4 on my arrival. I tried to talk him into transport multiple times, in multiple ways... without success.
University PD wanted me to take him because he was drunk, and they don't/can't/won't do medical monitoring of drunks, and can't release them until they are sober enough to not be a harm to themselves or others. So they are stuck in the middle... once he passes out, and/or throws up, they've got to send him to the ED... and that means waking me up in an hour to come get him.
PD also said that he wasn't going to be transported in custody.
I called OLMC - The Doc at the ED. She said that if Pt. was CAOx4 and refused transport, I couldn't take him. I know this... but documenting the call on a recorded line with the doc covers everyone. Doc said if the PD wanted him at the hospital, they could bring him up themselves.
Ended up that he got pulled out of the car and arrested for underage and drunk in public... he tried to play street lawyer, and it was pointed out that they WERN'T busting him for DUI... so he should just ACCEPT the right to remain silent, and not fight right now. I think he went up to the ED by LEO... and I went to bed.
So... long story short - What are your refusal protocols? Mine say if ETOH is onboard, I need to call command before I can get a refusal. So long as Pt. is CAOx4, understands the situation, and understands the risks of refusal, I can't force him to go to the hosptial.
There can be complicating factors, like potential head injuries, and/or danger to himself/others... but as you present it, my protocols call for me to call the doc. End result would be same as you - Try to ensure that they are going someplace safe, and hopefully where they will be with someone who can monitor them.