The Raikage are able to use chidori like attacks without Sharingan, so I guess its possible to use it in a way.
Besides being able to sense the opponent's attack would suffice as well as replacement for Sharingan. Through sensing techniques like Sage mode for example and maybe other forms.
Gentle fist can be used by attacking the chakra pathway system and surrounding organs by injecting your chakra into your opponents system.
Attacking the tenketsus is another method of Gentle fist, but you can do gentle fist without this as well.
Hyuugas can do gentle fist because their bodies are special as well.
Their bodies allow them to release chakra from their body more advanced than a non-Hyuuga.
So I guess Boruto can at least use part of it.
Maybe he can do Kaiten too.
I dont know if its possible to learn for him where on the body the chakra pathway system and tenketsus are. That without seeing it with his eyes, he can still use this due to his chakra mastery. Basically attacking the chakra pathway system and surrounding organs and maybe even the tenketsus, without seeing them through a Byakugan.
Yeah like this:
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