A small "idea".
How about making an app that takes your current streetpass data into a file (.multipass for example, watch this
https://en.wikipedia.org/wiki/The_Fifth_Element if you didn`t get it

) or QR-code. Then you can send it to someone or receive it from someone using forums, groups, discord etc. You put received file into a folder and import it through the app or just scan the QR-code with it.
This will be good replacement for homepass and streetpass. For example, in my town I can`t get even 1 streetpass data