Yes it was a private bus that I booked; it wasn't more than $20. I cant remember the name but there are a few that do the same trip from Jasper to Banff along the icefields parkway. Just make sure to ask ahead of time if they mind stopping at the pullout for you to hop out; you can always bribe the driver
The maligne trail is getting pretty overfrown from mary vaux through to maligne lake. I think they actually removed the trail markings on the parks map. It feels pretty remote though and you wont see many other people. I am not sure I would do that section again as it was mostly low elevation and bush / shrub, but if you want to do it to make a connector then its not terrible. I can try to find some old pics of that section later tonight if it helps.