To clarify, I meant plebiscites in Danzig or Memel, not those in Upper Silesia or the Corridor. That sort of delay would make the latter plebiscites meaningless.
On the other hand it indeed might be a good idea to delay the latter plebiscites a bit, so they can take place after the situation has actually stabilized and the choice is actually between Poland and Germany rather than brand-new-Soviet-fighting Poland and defeated-Germany. Those could be done in 1923 or 1924. As for reparation reduction, I would agree to it because the idea should be to actually pay the reparations in full rather than default on them or dodge them via inflation.