One option I’ve never tried (Haven’t been able to bid 12 yet)
The bomber bid can have Russia take out the Sz62 trn (land bomber in Aus) and take out the unprotected Japanese transport in Sz38 on Russia 2. If Japan decides to ignore the first turn capture of Sum, the bomber can sink the transport in Sz49 (Bor) if it is unprotected.
This leaves the Bomber without an attack on Russia turn 3, though.
This bid however won’t stop Germany and Italy from taking African IPCs (Egypt will be lost early) and puts a lot of pressure on Russia early.