Appending One Song To Another

Probably I’m not the only one with this little problem: I have lots of single-pattern .xrns songs, unfinished experimental stuff, and I’d like to paste some of them together to create larger songs. Does this work with renoise? Is there a command to not load the song, but instead append it to the currently open one? Ideally sorting out instrument number clashes too, appending the new instruments into unused slots and remapping, etc…

PHP-Xrns front end has a script called “MergeXrns” in which you can glue two songs together.
It has to be updated to read the new 2.5 doc format though, but your with older stuff, it will probably do nicely