Hello FSDT,
Got to say, loving this new Walk-In update! It's fantastic!!
Here in the UK, we use a mixture of both Jetways & Walk-In gates as well as them working together. A lot of our low cost operators will board the front half the plane via the jetway and the rear half via steps on the rear door.
Here's a photo that best describes what it would look like:
Would this be a future ability we could have?