Why do you dislike the idea of Boruto and Sarada being a thing, if I can ask?
I think they are good friends, support each other dreams, would probably die for each other, hardly have any negativity/boruto doesn't mentally or physically abuse her/sarada doesn't pine over him like a puppy
I think they have a healthy relationship, if went public, could be a great one.
I dislike team based relationships they're not good in general, it's too predictable and story starts focusing on them it would be typical manga.
Good friends can support each other without having a relationship, they support each others dreams, die for one another, not be abusive or pine over one another. That is a relationship in and of itself it's called friendship.
Boruto looks up to Sasuke and D rides him, from being a Sasuke D Rider to getting it on with his lookalike. Sarada looks up to Naruto and going from that to getting it on with his clone it's a little to f'ed up if you catch my drift.
More importantly Kishi constantly reminded us of the division of power, concentration of power being a bad thing it produced Kaguya. The whole story's been about that and it's been emphasised till the very end. That's why I don't see somebody coming along and fusing Hamura's, Ashura's and Indra's essentially making another Kaguya. It'll be to OP and undermines all of what kishi has done and stated. It's shitting on everything kishi told us with the Naruto series.
These are but a few of the reasons which is why I can't see it happening and I highly dislike it and don't see it happening.
I don't necessarily hate Sumire and Boruto's relationship, although I don't really understand Boruto's side to this since both he and Sumire haven't interacted enough as friends. Mitsuki and Boruto have a great friendship too, but that probably wold never be a romance because: Shounen.
Neither did Hinata and Naruto but they happened and we do however have clear moments of Sumire being overcome in Boruto's presence and her confession also pretty much point that way.
Mitsuki and Boruto I say because of Mitsuki's obsession and with the new age we have new ideas. The guy practically breathes Boruto, sleeps Boruto, lives Boruto and even licks Boruto. He'd eat Boruto if he could,. Shounen or rather Kodachi is practically pushing it.
Boruto and Sumire seem like the easy option. She likes him, boom.
Boruto and Mitsuki could be a interesting twist, but there are people who don't support gay relationships.
Boruto and Sarada could be a different thing.
Boruto and Sarada would be the same and predictable of a shonen, I don't see Kodachi doing it for the above mentioned reasons and it would be typical Shounen.
Boruto and Sumire would be the decent option as kodachi is hinting and has pointed to it. He saved her when he didn't have to, she looks up to him, she has every reason to like him, she found friends and belonging because of him etc. It's a match made in heaven, the ideal pairing as they would say.
Boruto and Mitsuki would be an interesting twist, I myself don't support gay relationships but I see it happening because of Mitsuki's emfatuation, and to emphasise new age new ideas. You know just like tech is coming in and changing the world etc. Like I said earlier the guy practically breathe Boruto, sleeps Boruto, lives Boruto and even lick Boruto. He'd eat Boruto if he could, I can't deny such things.