That would require America to stop threats and plans to invade China (at least through the KMT proxy), because it will assume an end to the civil war, something China would carry out if the security situation is safe.
1 trillion is not that much relative to the low value dollar reserves China has. As I see it, as long as America honors the end of ww2, drops it's claims and let the civil war resolve (hopefully bloodlessly), China can honor some of the KMT's mistakes. There is also more money bound up inside KMT controlled areas, if these funds aren't secured, they might leak to US anyways, or even worse, sensitive Chinese technologies that are worth more than 1 trillion fx.
If America seriously entertains the idea of talking about KMT debt, it is not something China should dismiss outright, but China needs to make sure America is abiding by the relevant international rules first.
As I see it, any opportunity to needle America about it's illegal threats of annexation is a good opportunity, it forces them to back off in order to keep an appearence of legality. And if America truly runs out of steam and would value a mediocre cash infusion over continued threats against China, then that is a serious prospect which politicians should consider.