I’ve just now found out about this, and it looks amazing. Kudos!
I haven’t dug very far into it yet, but I’m excited to learn how it works and to what extent it can be supported on Guncho. (Good news: full control over the build process and VM. Bad news: no Glk.)
Oops, sorry I missed your post. Indeed, that looks like a variation on the same problem. Can you post how you’re including the extensions?
I’m afraid that the current development snapshot will only give you an awkward, undocumented chimera (I’m in the middle of reworking the UI) without doing anything to address your problem. It’s on my list, though I’m hoping for a fix to Inform bug 666 that will simplify or resolve the issue.