I have a thought on the LSD/aMT combo - it is Divine. It makes IV MDMA crystal seem like a dysphoric disappoinment in comparison. And as that is very far from the case, that would make your planned combo quite the happy dose :D
I've not taken it in that kind of situation, but the experience and effects are just screaming out that although spending 24hours in a dustbin of shit would still be the greatest joy you've ever known, they'd prefer some movent (having seen a few of yourr moves - a given

) some people to spread the luurve to (again, in that situation, hard to avoid) and some fine tunes cos they help everything. Looks like you've got yourself a winner on your hands there
Now for the dose part. Never easy to guess at other peoples' ideal doses, but I was familiar and comfortable with no experience of aMT first time I tried the combo so somewhat similar. I went for 300ug of LSD and 25mg of aMT vapourised.
The vapourisation of the aMT is the good part. Apart from a much smaller dose producing similar effects to a much higher oral/plugged dose, there is a slight reduction in duration - so you'll probably be as far back down as you'll get other than the afterglow by the 24 hour mark and possibly a couple of hours sooner. And to top it off, zero nausea. Not a hint of it for me, and you can feel the first effects within an hour although it builds for a few after that,
I found that to be a pretty much perfect dose - I was higher than would seem possible, but always felt comfortable and in control - never overwhelmed - and had no problem dealing with people when I went out to do a bit of shopping. At a rave, looking a bit blissed is no bad thing but it would be noticed here so I must have been able to pass as simply being in a good mood.
I actually took them at the same time so the acid didn't quite have the legs for the whole journey, but did seem to last slightly longer than usual. The aMT should just go on and on for plenty of time but the peak starts at around the four hour mark, if memory serves but it lasts a long time - probably a similar duration as the whole acid experience with time to spare, so there's plenty of options available and I don't have enough experinece of the two together to really say. I suspect you could add the acid at any point after the aMT and it will work out very agreeably though :D