how are voidstones trapped and used?

for a special occasion I am planning to donate the players some spells with metamagic spell components as described here. one of the spells concerned will be the Disintegrate spell empowered with the metamagic spell component ‘trapped voidstone’, but I’m unsure how to present this to the players because I’m equally unsure how one would ‘trap’ a voidstone.

from what little I could find on voidstones (like a ‘Voidstone Field’ or the ‘Sargasso of Entropy’ mentioned in the Planar Handbook) it seems a nonmagical object that annihilates on touch anything and anyone failing a Fortitude saving throw. So then how would one ‘trap’ such a dangerous voidstone for safe use as a component during spellcasting? here’s what I considered so far:

  • I considered using the Quintessence spell to envelop the voidstone and shield the outside world from it, but on the one hand I feel uncomfortable introducing psionics in a campaign that has been psionic-free thus far and on the other hand I feel uncomfortable having to deal with the very existential and controversial issue of the potential annihilation of the fabric of time..

  • I considered the Shrink Item spell, but it doesn’t explicitly say the shrunk item is harmless (I do however like the idea of shrinking a medium sized voidstone and wonder if such a shrunk voidstone would still actively home in on living creatures in its vicinity)

  • I considered using caged zombie/skeletal/mummified undead rats and the Mage Hand or Telekinesis spells to thrust a voidstone into their belly. seeing as the voidstone requires a Fortitude saving throw and undead are immune to effects requiring Fortitude saving throws (having no Constitution score) it seems the rats could probably and plausibly function as a pretty lightweight container and a shield between the voidstones and the outside world. in fact the ‘Sargasso of Entropy’ in the Planar Handbook mentions undead lurking in a field of voidstones and behaving as if they would not be affected by them.

I would like to know if anyone knows of anything written about trapping voidstones and using them as spell components, or in the absence of such information if anyone knows of a plausible way of going about it. as you can see above, some creativity is allowed, even welcome.