Not yet, there isn't a Chainglider for 50x19.
50x19 gives a gear range of about 18" to 95", which is a slightly lower top gear than I have on my old derailleur lightweight bike, but a higher range than on my Raven Tour, the latter has 37x16, so about 17" to 89".
Not had the time to ride the Raven Sport Tour much yet, but I reckon the 50x19 combination should be about right for me.
I think a non-Rohloff specific Chainglider rear part for 18-22 sprockets would probably fit without rubbing on the Rohloff hub, and Chainglider front parts are available for 48T, 44T, 42T and 38T ring sizes, so a Chainglider may be an option in the future if I reduce the gearing a bit.
I have 42, 44, 46, 48, 52 and 54 size TA rings in stock, so it will be easy to increase or decrease the gearing.