Hi.
I built the Rufe. No we didn't use it but yes we could have bought it. In 1940 while "shopping" for aircrafts, mainly in the US, the swedish ambassador who had very good conections asked, on a private initiative, if it was possible to buy the new japanese fighter, the answer was yes and the japanese made an offer to sell the plane. The swedish airforce wasn't interested so nothing came out of it.
In the end we only got 60 Seversky EP-1 of all the aircraft purchased from the US, so an emergency purchase of italian R2000Falco, Fiat CR42 and Caproni CA313 was made.