Better way than IE10
I just discovered another Option to Play *.SWF- games on winows rt devices:
Switch to Desktop -> Charm Bar -> Systemsettings -> System & Security -> Flash Player
Go to the advance tab & scroll down,
-> Settings for trustworthy Files or something -> add -> add file -> select *.swf accept and Close everything.
To Launch the game, double clicking the file should do the Job.
Guide might be inaccurat, my surface rt is running with german as Default language. You can see where I am too tierd to fight autocorrect, can't you?.
please report,I think your Idea of running Flash games locally is great.