can you take the baskets off to use them as trekking poles after ski season is done?
The baskets are removable.
The basket interface should accomodate treking style baskets made by BD just fine. Though note,the tips are a little bit narrower than those on BD treking poles making the non-marking rubber tips incompatible without a little bit of duct tape. BD treking dedicated poles feature a plastic lined carbide tip that is larger and will fit the rubber end caps much better.