Illusionist Bracers and Twinned spell as a bonus action

Illusionist Bracers (GGR, page 178) Says:

While wearing the bracers, whenever you cast a cantrip, you can use a bonus action on the same turn to cast that cantrip a second time.

Twinned Spell (PHB, page 102) Says:

When you Cast a Spell that Targets only one creature and doesn’t have a range of self, you can spend a number of sorcery points equal to the spell’s level to target a second creature in range with the same spell (1 sorcery point if the spell is a cantrip)

Can I Twin cast Booming Blade (SCAG, page 142) as an action and using the Illusionist bracers, twin cast it again as a bonus action? Thus attacking the same 4 targets twice each?

Illusionist questions [on hold]

I’m doing a high-level adventure, which is giving me a lot of doubts.

A farmer discovered in an abandoned mine a talisman that guarantees illusion powers (a homebrew magic item). The farmer set up an illusory scene in the mine in which his pigs appeared to be hellhounds, piles of straw looked like piles of treasure, and he himself had the illusory appearance of a devil.

The village believes that the farmer was lost into the mine, and sent a group looking for him. The group found the farmer disguised as a demon, surrounded by hellhounds and treasure. The farmer began to blackmail the village, sparing their lives in exchange for treasure; he also forced the village to gather mercenaries to protect him (they’re elsewhere in the mine, but not in the room where he stands). The villagers hire the PCs to try to solve the situation.

What spells would be needed for the item to create such illusions? I’ve seen all the spells from the illusion school and I’m a little confused. How can I best handle this situation?