As much as I goddamn love Kenji, running him in Friday Night Firefight would be tough for a few reasons:
1) Kenji is a freak - his speed and coordination are on-par with heavily cybered individuals. In 2020, reflex boosting and combat sense mean you can have his speed and agility...and a gun. Arasaka security does. Smartguns, COT sights...it's pretty easy to hit someone at less than 100 meters. CDPR may override the FNFF rules on this, but that would be different.
2) Kenji loves ambushes. His skills are quite high in that regard and he uses them a lot. This is totally doable in FNFF! Except any half-geared soldier is running thermals, motion detector, even personalized radar. In 2020, Kenji would have to augment his skills with more tech than we see in Eden.
3) A lot of the full borgs Kenji fights also like melee! This is cool! But an Enforcer or Dragoon, SP 20-40, SDP 50+ in the limbs, etc, would a) ignore his knives and b)burst the hell out of him with something horrible and built-in. To compensate, he'd need special weapons and armour. Dodging in FNFF is much harder...dodging bullets isn't really doable. Melee, yes...but your opponent can jump backwards and up 10 feet, firing as he does so.
Honestly, in 2020, Kenji would use his guns a lot more. I've seen a lot of people build melee monsters, even borged ones...if played cleverly they do okay, but the same cleverness and a good rifle means you live longer.
In 2020, armored clothing is quite common, clothing capable of slowing and/or defeating knife attacks. Why? Because NIght City is a violent place and people are aware that a guy with a knife could happen any day. Awareness/Notice is a very common skill - and sees a lot of in game use. Paranoid culture, armed and borged. Worse than today. Dark Future,
Ah..viewpoint? Yes. Third person would be better for this kind of melee fighting...because video games like to give you a loooong list of advantages you don't get in real life. Melee/HtH in real life is confusing, scary, more confusing and if you are flanked or someone gets behind you, yi.