In other words, can one use dark side powers without feeling its temptation, without drowning in one's emotions, without falling into the darkness?
Without temptation, no; without falling, yes
This is something Ventress discusses with Quinlan Vos in the canon novel Dark Disciple; it's one of the Nightsister teachings, and something that she tries to teach him (emphasis mine):
Ventress informed him that she would train him as a Nightsister would be trained. "I had conversations with Karis and Naa'leth. They told me of what they underwent. Nightsisters know the dark side better than anyone. We grow up steeped in it, but we can use it as a tool and stay ourselves — unlike the Sith. That balance is what you must learn."
Dark Disciple Chapter 14
Despite being possible, it's evidently not easy, as Ventress admits later (emphasis mine):
"The Jedi have always taught that the dark side is a quick and easy path."
"You must be cautious how far down that quick and easy path you go," she warned. "Now that you have tapped into it, it can consume you. It is a delicate balance to strike — being free enough to feed from it, but remaining your own master."
"Like you did."
"I fought my way back. I almost didn’t make it."
Dark Disciple Chapter 17