No, what tends to happen if you do that is the invasion forces will reroute to your northern Japan-China land front if you are already on the beach. Tried that to see if it would work as soon as I had one division ashore. I had to catch all my marine divisions at sea as they headed north for Beijing and manually reroute them back south, plus cancel all of the now empty invasion orders. My 5 province landing turned into a one province dogpile into Shanghai.
Heh, I've had my share of debacles learning how to operate something I didn't know if I was doing wrong or it (the mechanism in the game) wasn't working right. For a while it seemed all my naval invasions would do 'instant replays' if I didn't cancel them abruptly once they'd completed, as in they'd do the invasion and then some time later I'd found they hitched a ride back to the originating port and were doing it over again!
It is pretty unnecessary against the ai in general and against Chian even when played by a player. China is just so weak a well-run Japan will smoke them at even odds. China is usually bringing a knife to a gun fight.
I wish they'd start doing better in China like they used to, one thing I really enjoyed about the Sunflower release was how China would play out. If you didn't intervene it would generally fall, and when you did send volunteers sometimes you could pull it out and other times you were bugging out from the Fall of Nanking not knowing how it would all turn out and your five or six little units seeming quite small and lost in the sea of troops around you and helpless against the tide sometimes. Now I sit back and coddle them and hope they grow into a real threat I can someday get some real army experience from but knowing the Chinese are likely to push them back into the sea all by themselves.