A few points:
1) I don't believe this is true that the fetus needs to be alive or in the 3rd trimester. Please provide evidence of this:

For Example:
"MRC5 cells were derived from cells taken from the 14-week old fetal lung of an aborted fetus in 1966; and HEK293 cells were isolated from cells taken from a fetal kidney of unknown gestational age in 1973"

[link to www.pdcnet.org (secure)]

2) The mRNA and Regeneron both used HEK293 cell lines in the testing, but not the manufactuering process.

3) J&J & Astrozenica do use fetal cell lines also in the manufacturing.

3) Fetal cell lines are used in multiple existing vaccines

"Vaccines for varicella (chickenpox), rubella (the “R” in the MMR vaccine), hepatitis A, rabies (one version, called Imovax®) and COVID-19 (one U.S.-approved version, Johnson & Johnson (J&J)/Janssen) are all made by growing the viruses in fetal cells. All of these, except the COVID-19 vaccine, are made using fibroblast cells. The COVID-19 vaccine (J&J/Janssen) is made using fetal retinal cells."

[link to www.chop.edu (secure)]

4) I believe most human recombination proteins are produced using e.coli but many do utilize HEK-293. I don't know if anyone has a list put together; someone post if you have this.