The 2-person model may be faster, but only when powered by two people. It is much wider than the single-person packrafts, with larger diameter tubes, so it is a very different boat.
The Telkwa’s length cannot be extended. The 2-person packraft could be shortened by removing 20-30 cm of material from the middle of the side tubes and floor, but this would add a significant amount of work to the project.
From your photo, it appears that you like to carry a lot of gear on your bike, so maybe the 2-person option is better for you, but I’m not sure. I don’t have plans to offer an in-between size packraft anytime soon.
Cheers!