Is it permissible for a pilgrim performing Tamattu' Hajj who cannot afford the sacrificial animal (hady) to fast the three obligatory days in Medina during the month of Dhul-Hijjah?

If someone performing Hajj at-Tamattu' (combining 'Umrah (definition) and Hajj) enters into ihram (definition) for 'Umrah, they must offer a sacrifice (hady). If they cannot find one, they must fast three days during Hajj and seven days when they return to their family. Fasting the three days between entering ihram for Hajj and the Day of 'Arafah is recommended. It is permissible to fast them from the time of entering ihram for 'Umrah or after exiting ihram from it. There is no requirement for these fasts to be consecutive.