I once thought about creating a pidgin plugin wrapper 

Since both support plugins, a wrapper shouldn't be that hard... especially since Miranda is more customizable 
(thus I hope all pidgin features should be possible, one way or another)But I haven't done anything yet 

 Generally I would prefer a wrapper over a Miranda plugin, simply because it's easier to maintain and why create a 2nd code base? Plus I would love some other pidgin plugins for Miranda as well 

 (since some work way better than Miranda's)