I didn't make it!
Is any possibility to set 64 map on single player with less computer played soldiers?
You can try to start a local network game, then start a co-op match. You can then change the number of bots
Change the number of bots via the FH2 Toolbox or use the BF2 server launcher and change the number there, launch and join ingame via multiplayer > join local. Important set mendowntime to 0 and tickets to 200, these are the recommended FH2 server settings becuase there is no revive like in vanilla BF2.