DOM, DOB and DOI are not tryptamines, but rather psychedelic amphetamines. This is an important distinction, as it means that the most common test kit (Ehrlich reagent), will not confuse them for LSD, contrary to what you said.

It is however true that there are substances which both fit on a blotter, and are indole psychedelics - e.g. 5-MeO-AMT, or other (other than LSD, that is) ergolines, such as LSB, ALD-52 (though these are extremely rare and (likely) share the safety profile of LSD). The Ehrlich test is not capable of distinguishing between different indoles, so you may get a case of mistaken identity in this scenario.