The fact MAN is in the list of the 'next 10' USPBC centres shows that the UK govt have likely already agreed to allowing it. You will notice some quite large omissions from the list, notably FRA/MUC/FCO/MXP/CDG/ICN/KEF, presumably because their governments have said 'thanks but no thanks'.
In terms of Austrian, GDS and the OS website show them using T2 at MAN. I assume this will change given OS is part of the LH group, with their group counterparts, LH/LX, being in T1?