I tried going from recorder to whistle, but being a bit inflexible and not inclined to try all that hard, I found I couldn't: there aren't enough holes and the one in the back wasn't there! I have a friend who carries a bag of whistles and recorders around, (descant and soprano), and plays either. Also another friend who only plays recorder, but blasts out Irish tunes as well as most other things like you wouldn't believe! He plays a lot on the tenor recorder but carries a bag of different types around. He is also a member of the Civil War Society which re-enacts battles from the English Civil War of the 17th century. The recorder is particularly relevant for that period.

mouldy