I think that is Part# 30046 : Window 1 x 2 x 2 2/3 Pane Lattice Diamond with Rounded Top


Looking at the pictures, I think Syberion has correctly identified the part. Just want to cover the moment where you mention part modification may be required. I don't think there is a need for modifications, it should work with existing parts like this: Additional parts are: Bar 1L with Clip Mechanical Claw Plate, Round 1 x 1 with Open Stud Lever Small ...


It's a bit late, but in 2020 the Monkie Kid line contains a minifigure-sized pig head:


I'm very late to the game here, but why can't we use the existing hole as a guide for an appropriately sized drill bit, converting it from Friends accessory size to standard LEGO horn size? If you drilled it slowly by hand, it would be really hard to mess it up.


I used tea tree oil, it worked but tended to leve a ghost and if removed that would impair the plastics ability to reflect sunlight.


Another possibility is one of the pig minifigures from the now-discontinued 2016 The Angry Birds Movie theme. For example, see set 75822, Piggy Plane Attack:

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