I use Contextual Alternates and defined in a calt-feature rule that selects different glyph forms depending on the surrounding characters.

I will share this code of course. And generally we could also think of where to upload the font and infos our open font 🙂  I licenced the font with SIL Open Font License (<https://openfontlicense.org/>), added some info in the meta data of the font – but I’m sure there’s something I didn’t think about...

But I hope that for implementing the font on the website it is ok how it is now.

According to my research the contextual alternates should work without having to define that in CSS.   
In case it doesn’t I read different options what to do: 

OPTION A

.selector {  
  font-feature-settings: "calt" 1, "liga" 0;  
}

  
OPTION B

.amro-font {  
  font-family: 'AMRO26 Fingerprint', sans-serif;  
  font-feature-settings: "calt" 1; /\* calt = 1 bedeutet "aktiviert" \*/  
}