Well Tom, if you are vague about the 319(

requirements, you may be equally vague about the N-470 requirements, from the N-470 instructions:
"Use Form N-470 to preserve your lawful permanent resident status for naturalization purposes.
Instructions
In certain limited situations, a person may be able to preserve residency, previously accumulated for naturalization purposes, even though he or she may be residing outside the United States for longer than one year. Thus the time spent abroad may be counted toward the residency requirement.
These cases involve persons employed in specific jobs in the United States government and private sector as well as religious organizations.
To obtain approval to preserve residency, such permanent residents must file a Form N-470 application before departing from the United States.
The regulations are different for religious workers proceeding abroad to perform religious duties. Religious workers may apply before or after departure, or after return to the United States. They are not required to have lived in the United States for a specific period of time prior to filing Form N-470.
Filing a Form N-470 does not relieve a permanent resident from obtaining a reentry permit, in advance of trips outside the United States for a year or more, nor does it relieve the applicant from the naturalization law's physical presence requirement."
The employment requirements are very similar to those of the 319 (

would check that out with an attorney as well.
Really hate to make negative comments about the laws of the USCIS, really tie your hands with the so-called lawful permanent resident status, not only employment problems in particular if you can only find a job overseas, but also trying to maintain a foreign passport while here, why should a foreign country want to issue you a passport if you are a LPR here?
Then you don't exactly get that PRC when you first arrive, use a none counting year under the EAD status before that PRC status clock starts ticking, then further delays in getting your citizenship that until more recently could add another one to two years to that time. Ha, we may wait that long just to get our oath letter. So we can be talking 4-6 years with your hands tied where the USCIS wants you to stay here and pay taxes, that is, if you can find work with all of our jobs being exported overseas.
Something else to write your congressman about.