You don’t need an XLWB Vito to meet your requirements, an LWB, which is the middle option, would be fine.
There’s a nice one in the classifieds right now 😜
I have a LWB Vito Dualiner and love it. The rear seats flip up (either the single left one or all three together). It is very comfortable, has a very tight turning circle (being RWD). I have had it about 6 yrs and it has been very reliable, you just need to keep an eye on the body work. I have had a couple of spots of rust but treat them immediately. I would definitely buy another.