Are Birkenstock fairly supportive? My mom is developing plantar fasciitis I think and I believe it's because of her years of not replacing old shoes and not understanding the need for proper arch support.
Attachment is nice (nicer than the old RO I had). But might be too basic for you.
I picked this up in deer and I am glad I kept it. Works nicely with my basic white tee, jeans and sneakers.