Is that rom not available anymore? If it is still available, I'd use a pc & 7zip to pull it, place it on the phone then place it in /system/app with a file explorer. As long as it was still compatible
Makes sense. If you have a computer & want to try it, get this, http://www.7-zip.org, & the rom on your computer. Open the rom with 7zip & go to /system/app. Find the mms.apk, put it on your computer then place it on your phone. Then move it to /system/app with a file explorer, set permissions & reboot.
You can try without adding the 1st. But I was thinking that if they went together in one rom, they may need to be together in the other. But as always, have a good backup handy.