I came up with something similar to that last one recently and it should be going into production. The great thing is it's also UK legal, so expect it within the next few months. This is it:
Whats with the methyl-1-keto-ethoxy bond though? I feel it'd only add to it's opioid properties and reduce potency but looking at the one before it seems like that's what you're going for.
Also any 4-MAR analogue will be neurotoxic and vasoconstrictive but that's the price to pay for a pretty incredible compound (4'4-DMAR was a bit of a wet blanket though). Just don't go too far and limit your usage and you'll be fine.
Oh and roi, that second compound won't work, it's got too long of an amine chain and there's really no need for that 4-methyl. 4-MAR is essentially amphetamine to aminorex's PEA, same with Phenmetrazine. The first might but looks weird.
Also soon to come is 2'-MMD-4-MAR, which, most likely, will blow a few socks off! If it's anything like it's amphetamine counterpart it should act as a psychedelic in some way but based on the 4-Methyl it'll reduce the HT2a agonism pretty significantly so I'm think just a very potent empathogen. As someone mentioned earlier the MDO bond would work but not as heavily as with MDMA so the 2'-MeO should push it up into that zone (in theory). I think a normal aminorex analogue would bring that psychedelia up a bit more but it'd lack the power of the 4-Methyl so I went with that instead.
Another on the way is N-Me-Lophophine-NBOMe. Not my idea but removal of the a-Methyl should activate it unlike MDMA-NBOMe made and tested by Nichols et al. There's also a series of very exciting psychedelics but I should keep shtum about those for the meantime!