Sorry
2,5-Dimethoxy-4-Chloro-AMT does not make sense, because the 2,5 and 4 designate positions that are in the DOX molecules (well, on the phenethylamine phenylring).
AMT has 2,4 and 5 positions but putting any similar groups there like methoxy or chloro groups would not be expected to make an active drug at all.
Look at the AMT molecule I attached, there are some things possible to hang on this molecule.
1 (N) - put anything on it and it will be much less potent or will not work
2 also a bad idea apparently
3 cannot put anything on here because all carbon bonds are taken up!
4 something like a hydroxy or acetoxy may be put here but I have read about effects that indicated toxicity
5 methoxy, put that on it and you have the existing drug 5-MeO-AMT
Considering 5-F-DMT appears to be an active drug it may be possible to attach a fluoride on the 5-position on AMT and get 5-fluoro-AMT or 5-F-AMT. It might be nice.
But nothing DOX-like is possible because they just have a really different build.
I don't know what would happen if you tried to put a chloro on the 6-position and a methoxy on the 5 though. That might come closest to what you are talking about. Perhaps another methoxy on the 7?
All these groups would probably prevent the molecule from docking into the receptor correctly but I would have to see how it docks again.