Edit: new version is available, go to this thread
OK, the first version is up and running now! .
I guess that means I’ve become a healthy fluffy teddybear 
I’ve decided to go with the XRNS-PHP frontend, and it made for a really fast and easy way to develop the tuning app. Thanks to everybody involved with streamlining Renoise XRNx development !!
The alpha version 0.1 can be downloaded from this location (XRNS frontend with my script added):
http://oscillity.net/microtuner/xrns-php%200.1.zip
It successfully translated all *.tun files I threw at it, but if you fare otherwise, please tell me. Version number is 0.1, so there is room for improvements and bug fixes.
Edit: Download Scala, and the Scale Archive if you need tuning files (there’s also a guide as to how to export *.tun files on their website) . Lots of plugins support the format as well, so a quick search on your harddrive might reveal some additional tunings