There is a company (Iolaire - www.militia.co.uk/piobbeag/) that are making tunable elcetronic chanters which have highland fingering but can be switched between the highland and smallpipe sound - they are relatively inexpensive. However, nothing beats practice I play small pipes highland pipes and whistle (not all at the same time)and find that it is easy enough to switch between them.

I like the sound of teh modal whistle. Hobgoblin have a whistle which is played the same way as a uillean pipes and even has a drone - interesting!