Anyone here prepare Form 1042-S?

[Margaret CPA in OH]

I've seen several of these from clients over the years as I have many referrals from clients at the local university.  Now, however, my church wants to hire a foreign national for a part-time music position.  She is in a master's music program so it aligns with her major. 

She/university is in the process of filing I-765 for the EAD (Employment Authorization Document) which will likely come in a couple of months.  Our payroll service (Paycor) does not manage these but I believe I can.  I am currently treasurer - again.  I've read the instructions and it seems relatively clear but - there are always buts, right?  She will be paid quarterly.

Any hints, advice, recommendations? I would like to assure the choir director that it is manageable once she receives her EAD.  Thanks!