I've remembered another one that will work on K3 keyboard is
VlasovSoft PBchess (Cool Reader + Games) it's more than CoolReader but it works and even has it's own Screensaver (but it's still based on Craizy Coder's port you could try it but I'm not 100% sure).
P.S. Oh they are different, Vlasov changed it a lot, I've compared two and they are different at least in interfaces and some functionality, try it out if this one doesn't work for you.