I see you almost every day on my commute. Cool Car, that's all.   

it's a bit convoluted, but if you save the route as a gpx file someplace that you can get to it on your phone (Google Drive for me), then open the file on your phone using your cycling app (Garmin Connect, Elemnt, etc), the map should appear on your head unit. I don't have a paid account, but this is what the RWGPS interface looks like on my laptop:   Otherwise, you can save the file: Upload the file to a cloud storage app, open the storage app on my phone (Drive) and find the file. tap the three dots and that give you the option to "open with" pick the app that is going to send your route to your bike computer. in my case, the Elemnt app. yes, of course I want to import the route. the route appears in the app, which will then sync with your bike computer.  

as an FYI I have free Trailforks and I find trails, routes or create my own.  Download the GPX and upload to my Garmin. Now this week I was at an unfamiliar trail head (Jack Brookes Park) and I somehow loaded League City and spent 15 minutes wandering around a trail thinking it would sync.  Finally realized my error.

With RWGPS, is evreything paid or are you able to send data to your Wahoo without a subscription? I logged in, made a few routes and then tried uding the app but it wants money to actually use the routes. 

Hopefully we are just under 10 hours for flight 8.