What is the purpose of buying MC-21? It is the same type of aircraft as C-919. China have no problem purchasing such type like A320. The sole purpose of C-919 is to be able to make it. How does a "good will" help to realize that purpose?
If Chinese airlines purchase MS-21s it should be on merit, not industrial or "good will" considerations, I agree. That said, if it delivers on its promise, there is considerable scope for this to happen - while the engine is the same, the airframe is a generation ahead of the A320neo. Customers will want to wait for it to prove its reliability in real-world operation though, so that's not a short-term alternative.
PD-14 is the same class as CJ-1000. Once again what is the point of buying PD-14 which itself is also under development? It may be a little bit ahead of CJ-1000 on the way, but the whole thing engine or aircraft is about building competence than assembling.
First PD-14 core on bench in 2010, first complete engine ground run in 2012, flight test campaign commences in 2015, Russian certification awarded in 2018. EASA approval is pending, but the base version (as opposed to derivatives) certainly isn't under development anymore. Define "a little bit", according to the above dates it is running some 5-6 years ahead of the CJ-1000A!
As for foreign content in the CJ-1000A which might be subject to sanctions, here's a chance find I came across recently:
This is, of course, a European (UK) company, but CAATSA is cleverly designed to incentivize compliance by non-US businesses. It explicitly threatens to deny US market access to any company which trades with entities on the sanctions list and since for most aerospace suppliers the US remains a bigger source of income than China, most will be forced to cut ties. The resins and fibers that became unavailable to Irkut for the MS-21 wing due to CAATSA were sourced from Belgian and Japanese companies, respectively.