My process
Complete K1 application process
Get medical in K1 home country, tell them you will not get the vaccines at that medical and will do so once in the US for AOS
K1 is a nonimmigrant visa and does not require vaccines, you will only need them at time of AOS
May need to print and the law for them that states this if they give you problems
Get K1 visa and arrive in US.
Get married and apply for AOS
Did not send in medical exam with AOS package
RFE for medical exam, sent in with box checked that a waiver will be filed.
Had no documented records of any vaccination, had some titer tests done beforehand to show immunity to some of the diseases.
Received another RFE for i601 since the medical exam indicated a waiver will be filed.
Submitted i601 package and i485 approved within a few weeks.
I strongly suggest getting a lawyer which will cost about 6k all in. Would be difficult to explain the small details that should be included and how it should be worded.
Was told strictly stating religious OR moral convictions should be done, may be tricky to do both even though there is some overlap.
i601 package consisted the i601 form, payment, statement of hardship (~2 pages), and statement of beliefs (~5 pages).
It isn't necessary to include affidavits from friends, family, religious members. I was advised not necessary and isn't strong proof on YOUR beliefs. Statement should be what YOU believe and words of others aren't strong.