The Karaś big brother the PZL P.46 Sum has always made me think of a fixed gear Grumman Avenger.
As to re-engining the P.23/P.43, for a number of reasons the most likely (in RW terms) European liquid-cooled
inline engine would be a Hispano 12Y.
BTW the export model P.43 was a P.23 with a Gnome-Rhone 14K radial.