Super Mario RPG: Legend of the Seven Stars is a great game but, the PAL territories never got to play it. And apparently, it isn’t easy to mod for a PAL system. It doesn’t look like you could use any of the good old fashioned tricks to get it to play. Importing a North American or Japan console is one way to do it, or … you could take apart the cartridge itself and do some rewiring.
www.mmmonkey.co.uk has the solution if everything you’ve tried has failed.
However, if this is too much trouble or too risky, SMRPG was released to the Virtual Console.