Linking GBA games

Morning all,

Not sure if this is possible and a quick look around the web hasnt been helpful.

Im trying to data transfer between Golden Sun and The Lost Age, you can password transfer but its 6 pages of almost 40 characters per page, the other option is via a link cable but as im emulating on bizhawk im not sure how to do it/if its possible.

Ive tried creating a multi disk bundle which seemed the sensible way to do it, but it loads both games to "NINTENDO" splash then freezes so no idea (selected GBL as the system as there was not GBA option)

Any advice would be appriciated.