Sorry for the late reply, I didn’t have time this week to look into what a swapfile was and I delayed my response until I did. I will definitely be using a swap file since I do not ever use hibernation and encrypting my swap partition seems like a hassle.
I’m currently reinstalling things (after accidentally bricking the Windows partition and finding myself dissatisfied with openSUSE). Hopefully with just 4 partitions total (EFI, Kubuntu encrypted, Mint Xfce encrypted, data). I am removing the /boot from each because unless I’m leaving /boot unencrypted there’s no reason to separate it out. Unfortunately encrypting /boot means GRUB doesn’t detect it automatically in the Kubuntu installer so I’m still working out how to correct that.
I don’t believe this is true, but since I don’t need hibernation I’m going with a swap file anyway.