Automatic generation of append string for BetterDiscord plugin
Unfortunately that's impossible with the current code base, as it requires all the stickers actually being displayed on the page (to count them, among other things).
If you haven't noticed, since Nov 9, a feature to add LINE packs directly from Magane was added: https://github.com/Pitu/Magane/commit/96e7b63ebee1363bd6c2455924cdb0f0d81c568a
It works with region-locked packs as it uses Magane's server as proxy.
Is there any chance you can implement the box when the pack is region locked as well?
Right now the only workaround for region locked packs is to download the pack with a script like this and then check the file IDs.
There's plenty of empty space in the region lock page so if your script can grab the necessary info (which I believe it should) it should also display it there.