Within the engine that we're using (RPG Maker MV) there isn't an easier way for a more integrated save/load system. We'd have to look into custom made plug-ins / mods... but it's not something we've looked into too much at the moment.
Otherwise though, thank you very much for the kind and enthusiastic praise of the game! I hope that you'll continue enjoying your time with the game, and grow fond of even more characters... and maybe, just maybe, you'll see more of the folks you enjoy the most in future content~!