Just a thought, it may or may not work, but how about trying the Meixner test?
Its not typically used for this, rather, its a test in mycology for detecting amatoxins. These are a group of altogether preeety fucking nasty ass cyclic peptides with an indolic core, more or less liquefies your liver, if you are unfortunate or/and stupid enough to take so much as a bite out of certain mushrooms, such as Amanita phalloides, A.virosa etc. (death-cap, destroying angel, respectively)
Test involves taking high-lignin paper, such as newspaper (lab filter paper specifically is out for this, its pretty low in lignin) and after adding a sample to a piece of the paper, placing a drop of concentrated hydrochloric acid, after a while, if the test is positive, it should form a purplish halo around the outer area of the sample.
No guarantees this will work, but the Meixner test is known to crossreact with psilocin/psilocybin, so unfortunately can't be used for ruling out E.g Galerina autumnalis hiding in your Psilocybe cyanescens harvest (spore print is needed for that), but it could be worth a try.