I believe he wants to do both as you say. Problem is if the Americans think his right hand will take the weapons, pass them over to the left hand and the Chinese will have a look at them then they may decide best not to sell anything too nice.
Americans suspect that all the time even with Lee's and CSB's administrations. Ma's would be nothing special. And there is also a whole bunch of countries out there that has close ties with China that has F-16s and other associated modern weaponry. But if you always worry about that you won't get far into arms sales. That's why export variants are tailored in the first place. And considering that Pakistan is going to buy Block 52+ F-16s, I honestly think selling such planes to Taiwan and worry about China snooping onto them should be less of an issue.