Started out on the LIKE200i....and because of the seat bump and the low bars, I had to splay my knees on corners to keep from collecting the bar ends. But I quickly learned to do that - and it was no longer a conscious issue.
Bought a Honda Forza where you sit down in the scooter - rather than atop it as on the LIKE. But still my knees were just mm's away from the plastic although well below the bars (because they are bare on a Forza and can be easily rotated up) Quickly learned to be comfortable on the Forza.
The Burgman 400 has a seat bump that can be moved back 100 mm's. Does not sound like much - but my knees are well away from everything now. The ride is good on this scooter, too.
I guess my point is - perhaps you can fix the seat issue or get comfortable with it over time? I would not necessarily discount a scooter just because of the seat if I overwhelmingly liked everything else about it.
A great scooter can be made to work for you if you are able or willing to re-work the seating.
Might be a tough call.
Stig