R2Y2's getting removed, J7W2 to be added?
As we all the the R2Y2's are paper planes. Not real, never made, didn't exist at. Except for it's predecessor the Yokosuka R2Y1 Keiun (景雲) being the prop model the R2Y2's derived their original airframe from.
Some may already know but for those who don't; the j7w1 Shinden in game currently is and importantly WAS a functioning prototype and proof of concept for a JET powered model. Rather than propeller driven how we have in game. In my opinion there wouldn't really need to be any significant changes made to the in game model or it's flight characteristics, expect for one. It's max speed limit rip speed. Given how aerodynamicly 𝙨𝙝𝙝𝙡𝙡𝙞𝙞𝙘𝙘𝙠𝙠 the design of the airframe from the Shinden, is and it's original concept, can help lend some leniency to increase its max dive speed from 559mph(900kmh) to 683mph(1100kmh) for reference the max dive speed of the 262 A-1a is & Kikka 652mph(1050kmh), 680mph(980kmh) seems fair for what it is right? This would allow the J7W1(or a J7W2) to better do the one of two things it does good already being, diving away from pursuing opponents, and the other being shooting anything lol. In addition to the max speed change, I'd suggest separating the 4 30mm cannons into two pairs to be shot independently of each other as it was designed to in real life. The two separate cannon systems could be researched independently, just alike to the Kikka. And 𝐞𝐪𝐮𝐢𝐩𝐩𝐞𝐝 separately, as to slightly reduce overall weight.
As far as what Rank and BR I'd be inclined to say Rank 5 obvi and a br of 7.3 reflecting it's slight, if you will "speculated" performance compared to similar aircraft.
I haven't flown the he162, but if you have. I could only imagine if gaijin were to add a Shinden Kai it would have a similar acceleration curve, seeing how both aircraft are single engine early jet fighters/intercept aircraft. One could imagine a playstyle something like the F-104 or Mig 23.
Thank you for reading this far :)