NBOMe's have that relative selectivity for 2A vs 1A... they aren't the greatest but maybe less unsafe than some entirely novel structure?
Don't phens in general usually lack any major affinity for 1A? The biggest challenge seems to be finding compounds that are selective for 2A over 2C.
25I-NBOH, a relatively easy-to-find compound, is actually among the most selective 5HT2A agonists known (yes, even more selective than the NBOMe's).
I think only 25CN-NBOH and Juncosamine are more selective, but the former is too short-lasting and the second too complex of a synth to be considered worthwhile by RC vendors.