A 35-year-old multiparous woman from Mumbai with a history of three previous vaginal deliveries presents 6 weeks postpartum requesting contraception. She is exclusively breastfeeding her newborn and has no contraindications to any method. She is concerned about the risk of ectopic pregnancy and wants the most effective long-acting reversible option. On examination, the uterus is involuted and cervix is normal. Which IUCD insertion timing and type would be most appropriate?