A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Kaiu Village Reaction: After your performing Personality enters play from a Province, pay 2 Gold: Create a +1F/+1C Weapon Item, and attach it to him. Reaction: After your performing Personality enters play from a Province, pay 2 Gold: Create a +1F Armor Item and attach it to him.
Luxurious Silk Bow this card. Produce 2 Gold. Reaction: Even if this card is bowed, when paying for an action: Produce 2 Gold.
can luxurious silk's reaction be used for Kaiu Village?
Kaiu Village Reaction: After your performing Personality enters play from a Province, pay 2 Gold: Create a +1F/+1C Weapon Item, and attach it to him. Reaction: After your performing Personality enters play from a Province, pay 2 Gold: Create a +1F Armor Item and attach it to him.
Luxurious Silk Bow this card. Produce 2 Gold. Reaction: Even if this card is bowed, when paying for an action: Produce 2 Gold.
can luxurious silk's reaction be used for Kaiu Village?
Reactions are actions, and the 2 gold in their contraints are the actions' costs.
So, yes, Luxurious Silk's Reaction can pay for them.