Sahuc fees;sleeping with blankets while in ihraam;purdah and sleeping;shaving of the hair

AS SALAAMUALYKUM MY QUESTION IS WITH REGARD TO HAJ.

1. CAN WE PAY SAHUC FEES WITH INTEREST MONEY

2.AT NIGHT CAN WE USE A BLANKET TO SLEEP WITH IN IHRAM

3.IN MUZDALIFA MY WIFE WILL HAVE TO KEEP HER PURDAH WITH THE GOLF CAP ON,CAN SHE SLEEP WITH IT ON AS WE SLEEP IN THE OPEN

4.I HAVE READ THAT AFTER YOU PELT ON THE 3RD DAY,YOUR SHAVING OF HAIR MUST BE DONE IN THE HARRAM BOUNDARY,IS AZIZIYA IN THE HARRAM BOUNDARY