I was re reading the manga recently,and Obito temporary spirit transferating jutus caught my attention. The only reason that obito was manage to exit the spirit world was due to remaining sage chakra(from the tailbeasts),and kamui from his MS.
Sasuke on the other hand have a sharinnegan that allow him to have a wider range of visions and a dimension portal jutsu which he can travel to anyway worlds he wishes .
Since Sasuke is a transmigrant of Indra and currently the new sage of sixth path (because of the rinnegan and protections duty of the 5 villages),he should be able to visit the spirit world and teleport the spirits of past shinobi into the real world(Sasuke already said ,he knew a way to be immortal)
As a result,Sasuke could place these spirits into new host (like Zetsu) as their vessel.I know some of u guys will think spirit will not be able to control their host,but Tsunade past bf was able to use tsunade body to dodge Madara attack,why they can not do the same to a mindless zetsu clones ?Sasuke can cast genjutsu on the zetsu clones to erase their mind for the past spirit to take over.
In addition,zetsu are known for their body tranforming ability,this could make the spirit transform to their former appearance and dwell with their love one in the real world
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Since Sasuke is a transmigrant of Indra and currently the new sage of sixth path (because of the rinnegan and protections duty of the 5 villages),he should be able to visit the spirit world and teleport the spirits of past shinobi into the real world(Sasuke already said ,he knew a way to be immortal)
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In addition,zetsu are known for their body tranforming ability,this could make the spirit transform to their former appearance and dwell with their love one in the real world