Could it be a added a flag in the config to force the spawners mined with Silk Touch to drop as empty spawners? This way, incentives the players to get a sword with Capturing (even more?). Right now, is no more different than setting a spawning chamber to make an XP farm, but with the addition of freely doing it whenever you want, just as soon as you get Silk Touch. I'm kinda sure that this can be done on our end by just setting a custom datapack that overrides the loot_table being added to the Spawner (at least, that's what I think Apotheosis does in the background).
The intent is to provide players with a sense of pride and accomplishment for exploring and expending extra time setting up the farm (yes, I "stole" that famouse EA quote).