To convert it to a 7 player game with China, you could need to either add an IC in China, give the Chinese Player 1 IPC for territory held and allow the US Player to give the Chinese a certain number of IPC per turn in the form of Lend-Lease, or forget the IC, give the Chinese Player one IPC per territory held and allow the US player to supply Lend-Lease units with the units initially appearing in India. If a land route is open to China from India, you can send in land as well as air units, if no ground route is open, then infantry and air units, with the infantry being those Chinese units formed using US weapons supplied by the “Hump” airlift over the Himalayas. I have some house rules for adding China to the A&A Pacific game posted in the House Rules Section of the Board that you could also look at.
Well, I was thinking on simply let a 7th player play with chinese units, in the same turn as USA, but you have interesting ideas here, especially the idea about Burma Road, and the IC. Probably your idea is better for historical accuracy.
I have another possibility: make China a totally independant and normal playable power, give the IC as you say, also a AA gun (as in AAPacific), both in Chongquing (the capitol). Boost Chongquing to 3 ipcs (for simulating Kuomingtang base) and Yan’an 2 ipcs (communists forces), give 1 additional IPC for Burma Road. It would make China a 11 ipcs country, but probably only the first turns until Japan attacks heavy. For balancing, give Japan a 5 ipcs bonus for taking both Chongquing and Yan’an and boost Japan’s capitol by 3-5 IPCs. Also, just for fun, give China a bonus if they liberate all her homeland (including Manchuria and such). Make Chongquing a VC an cancel Ottawa as VC. Finally, make China playing after USA.