1. Is there a possibility that we get the Hiba document registered and then sell the property or register the document as settlement deed (Which one will be valid).
The Hiba whether registered or not is valid and it is valid even if there was a oral hiba.
However, the notarised title document cannot be held as a valid title document even to execute this hiba, but since the property has been in your possession for more than 3 decades, a st for declaration of title can be filed before court, get the title declared after which the property can be sold by executing proper and registered sale deed document favoring buyer.
2. Will the document be considered as valid and become a link document.
This is a circumstance being created, hence the validity will depend upon the buyer's lawyer's opinion for the purchase of this immovable property.
3. Bases the registered (Hiba or settlement Document) new buyer's registered document can the new buyer apply for loan etc.
The answer to the above question is the same for this too.
1. Is there an option in Land Law that it is mandatory that they give us way if it is mentioned in the sale deed?
You are protected by the provisions of law governing easement rights hence a suit claiming easement rights for ingress and egress to your property may be claimed as a rleif through court of law agaisnt those people who block your way for access to road.
2. Will the Mandal authority have right to interfere and help us secure our enter route bases the documents.
They may be toothless in this regard, only court has full power to ensure your rights and interests are protected legally.
3. As a Executive Magistrate can the mandal officer enforce the other land owners to give us way rather then ask us to go to court - we do not want to approach the court as that will be very time consuming.
If you have wasted such a long time why dont you wait for some more time to get the reliefs properly and lawfully through a civil court.
The mandal courts may not be very effective and you may have to rush to the civil court only after you are not getting relief from them.