What about the Archies arch support thongs?

Firstly, be careful on terminology: What goes for "thongs" in Australia is not what the rest of the word call them! (google it and you will see what I mean).
They call them flip flops in most of the rest of the world (and 'jandals' in New Zealand). Thongs in the rest of the world refer to a skimpy piece of underwear!

Having said that, I like them. They are similar in their arch shape to a lot of over-the-counter foot supports, so can be used instead of that. They are useful for those that do need foot orthotics to use as an adjunct, so they can wear that type of footwear.
We sell them in our clinic and they sell themselves; almost all that try them buy them!:
https://croydonfoot.com/archies-thongs-are-selling-themselves/

A lot of other clinics sell them and you can get them online:
https://www.footstore.com.au/product/archies-thongs/