Possible to isolate OpenType in a separate project ?

[ststeiger]

I need the function
public OpenTypeFontface CreateFontSubSet(Dictionary<int, object> glyphs, bool cidFont)
found in
OpenType\Fonts.OpenType\OpenTypeFontface.cs
in another project, together with XFontMetrics.

I've isolated the OpenType code for my purposes here:
https://github.com/ststeiger/PdfSharpNetStandard/tree/master/OpenType

However, it is intertwined with the PdfSharp code (XFont, XFontSource, XGlyphTypeface, XPrivateFontCollection, FontFactory, some enums, etc).

Would it be possible to refactor, and isolate OpenType in a way that it doesn't depend on PdfSharp ?
Extra bonus points if GDI components could be avoided as well (GDI doesn't work on Azure Web App).