Without the heat See if this will suffice for your needs. I don't know for sure how well this would work or how long the evaporation process will take, but it's the only thing that I can think of that is relatively easy to do. Maybe someone else will have some input on this idea.
Let me lay out a possible methodology. We're gonna go back to high school science class!
Since you say you want to preserve the maximum amount of terpenes, I would just do a dry ice shake or ice water shake. Dried flower would still work, but you're going to lose
some terpenes in a drying process.
Ice water hash would have to be dried.
Dry ice hash could probably be used within the hour with no problems. It just depends on your extraction rooms temperature and the humidity.
Do the frozen alcohol extraction bit.
Filter out the rosin heads and stems with a Büchner funnel.
Now here comes the 70s science class bit.
You're going to need two things.
And automotive style vacuum pump you can get those Locally at Harbor Freight or just order them through Amazon. If you can get it locally it would be better.
I'm pretty sure Amazon is going to be the best place to get the next item. The next item is a vacuum dome. The ones I saw had some sort of gasket at the bottom. If they don't have a gasket at the bottom you can glue sheet rubber to some sort of platform that you make. One inch plywood should withstand the stresses. You could use a
thick marble plate like what you would work candy with or chocolate If your dome has the gasket.
Just put your filtered alcohol cannabis solution under the dome In a glass bowl with a lot of surface area . It's still gonna take a fairly long time to evaporate the alcohol but it would be a lot quicker and more sterile than open evaporation. It still needs to be done outside and with a fan blowing on the vacuum pump.
What's left is not gonna be like RSO since it's not heated.
The reason I said get one locally is that the alcohol Vapor is really hard on that vacuum pump. After every use I would turn it on and then missed some all into the suction line to help lubricate things. That's just going to forestall the failure that eventually will occur. Take out the extended warranty .
It is basically an ExtractCraft Source Turbo Concentrate Extractor without the heat
The end product should be pretty decent.
Like I said, that's untested by me, but I see no reason why it wouldn't work.