I know this doesn't fit your requirements nor is it modern but this is what I've been using for the last few years. It's outdated but works. Then Yatse and XBMC Remote came along and made it obsolete. Still, nothing beats a dedicated remote.

http://www.amazon.com/Azend-Group-MediaGate-GP-IR01BK-1-Channel/dp/B0028N6XDA/ref=sr_1_1?s=electronics&ie=UTF8&qid=1415821587&sr=1-1&keywords=GP-IR02BK

A little key remapping to change it from WMC to XBMC and it does almost everything I want.