So last time I prepared pharmahuasca, I did iso pulls on evaporated rue tea to get full spectrum powdered extract, which I dissolved in vinegar and put in a dropper bottle.

I then dissolved freebase acacia confuse extract in vinegar and put that in a second dropper bottle.

Save for the ability to tweak the ratios, is there any reason one shouldn't combine the two in the same bottle?

Freebase DMT will convert back in to DMT-acetate and will sit comfortably with the harmala-acetate alkaloids in the bottle.

As long as the PH isn't too low, maybe above 2-3 then it should store for ages. Low PH (1-2) has been known to degrade DMT.

P.S. I hope you got your doses right here, it would suck if you hadn't

So It would be a potentially great pharma in a single eye-dropper bottle, right?

If this isn't a common thing, why isn't it?

I would assume because people like to have confirmation and weigh their doses. What happens if you have a muscle jerk reaction and end up dropping 20 drops in your mouth and swallowed? Plus, no one would like the taste of that. That is why the invented capsules!

Yes, I did ( and many others did too ) play with acetate dilution of n,n DMT and harmalas. Used to mix in OJ for pharma, or simply double boiler evap the vinegar to gather the n,n DMT back for a vape.
But, the taste isn't that great, and evapping isn't the straghtest way to dose.

I used to drop acetate dissolved in vinegar into thick berry juice or smoothie by the dropperful...the juice tended to cover up most of the taste and it was VERY convenient for dosing without a scale..