Question: What would be the safest way to warm up the 75% ethanol solution for salvinorin evaporation complexation?

While I used the oven at low temp on a small final evaporation, I'm wondering if there are known safer/standard ways to do this for a shallow glass tray (I don't see an easy way to do a water heat bath due to bulkiness).

The oven has heating elements that can get hot and ethanol vapor can get to them. Opening the oven door may help, but is it completely safe?

I'm wondering because if we do find that heat aids in complexation during evaporation and the oven dry is scaled up by someone there could be large amounts of ethanol evaporated and that could be dangerous. At the end of the day want us to find a safe and fun procedure so we can receive the salvia sacrament sublingually in a new, convenient, and interesting way.

Thanks for any ideas/feedback.

Edit: This may be relevant to the discussion.