Of course it could be done. But only if you are experienced using (l)N2. The boiling should not be too violent at all. Don´t lead gaseous MeAm into the (l)N2. Instead use use a cooling bath with the nitrogen to cool a flask which you lead dried MeAm into. This will make it easier to weigh your amine since you don´t need to scoop it up from liquid nitrogen with a spoon.