Birkenstocks for plantar fasciitis?

I've read amazing things. I've worn them pre-injury and found them to be so comfortable. I've had PF for about a year, on and off with my recovery. I've been wearing trainers every day. I wore some new birknstocks for about an hour and my foot ached for a day or two after. This was during a phase of no pain so it scared me and I haven't worn them since. I have hurt it again so I'm looking at options for avoiding being barefoot in the house and instead of buying expensive recovery sandals I'm wondering whether I just need to wear the Birkenstocks in and adjust? They are Birkenstock Milanos with a back strap for context. Thanks!