I think I'll solve my issues with the EFI partition and dual boot and will probably go with a different system like the the one I think you proposed FrenchPress, using this : https://www.amazon.ca/gp/product/B00X5HAKXC/ref=ox_sc_act_title_1?smid=A3DWYIK6Y9EEQB&psc=1
I'll just swap out one OS for the other when I need to. That way I don't really have to worry about the EFI partition size.