Multi-Constillation Support for custom Sentences

[JasonPittenger]

Can you expand the custom sentence extraction to support multiple systems?

For example, I'm looking at VDOP that's coming from the GSA sentance. I'm using

TinyGPSCustom   vdopGP(gps, "GPGSA", 17);

However, I am also using Beidou Navigation Satellite System (BDS) BD, Global Navigation Satellite System (GLONASS) GL and Global Navigation Satellite System (GNSS) GN. So I really should use

TinyGPSCustom   vdopGP(gps, "GPGSA", 17);
TinyGPSCustom   vdopGN(gps, "GNGSA", 17);
TinyGPSCustom   vdopGL(gps, "GLGSA", 17);
TinyGPSCustom   vdopBD(gps, "BDGSA", 17);

And manually combine the values somehow.

Is there a way to add a custom extraction that works for multiple systems? As in, the command would only ask for the sentence type and not the system prefix?

For example:

TinyGPSCustom   vdop(gps, "GSA", 17);