Hey,
just in case you or someone else is still interested in this. I'm working on an integration of VB6 into
SharpDevelop in my spare time. Why SD? Because it is free, is tiny and also has a pretty good and nifty text editor.
You can check out the progress here:
https://github.com/chrishensel/vb6leap[
^]
The SD-Add-in is under construction, but is making progress. Building works (you need to have VB6 installed). For the rest, it is better to check out the source and wiki since there is no documentation yet.
It is open-source and free of charge.
HTH
chris