My guess is, that, if you plan your war based on a '42 invasion, doing everything you can to keep tensions as low as possible with the USSR, possibly even including diplomacy, you could manage it. Even so, you'd be ceding them time to get Infantry weapons to level 2, plus some other research and re-arming done, so not sure it is worth it.
I'd suggest trying that against AI a few times to see.
I tried it. Put a lost of chits, didn't annex Lithuania, and still in January 1942. they declared war on me.