Swibn has studied all of your Al/Hg synth's and the one you mention IMHO, has poor yeilds.
Osmium reports near quantative yeilds with his variation and this is what swibn finds attractive.
Also the fact that 0.31mol can be aminated in a 1000ml rbf, thus a 500gm 12litre reaction vessel(spherical shape, multi-socket flange(for overhead stirring), shouldn't be too difficult.