Phenethylamines 2C-B, worth trying on its own?

[Allylbenzene]

That paper also mentions high levels of protein binding causing delays in pharmacokinetics. The fact that mescaline’s potency correlates in vivo and in vitro argue against its main effects being caused by some cryptic metabolite.

Agreed, that paper wasn't a good exmaple. This is more interesting, from "Trouts notes" on The Cactus Alkaloids:

Inhibition of aldehyde dehydrogenase by calcium carbimide “severely” enhances the pharmacological effects of mescaline in rabbits. Neff & Rossi 1963 cite Friedhoff & Goldstein 1962.
...
In rabbits, which show no symptoms from mescaline, pretreatment with calcium carbimide causes some effect whereas calcium carbimide by itself does not.
...
Rabbits, which are estimated to be about 70 times more tolerant to mescaline than humans, developed “severe” reactions when given very small doses of mescaline after pretreatment with calcium carbimide implying that aldehyde dehydrogenase inhibition enhances the pharmacological activity of mescaline.

The only reports i've found on the combo of mescaline + ALDH inhibitor: