If you've got an old 486 or early Pentium cooling fan, mount it inside the 54G.
You can find +12V near the power inlet.
You can use plastic/nylon motherboard standoffs with the little button clipped off to hold the fan up in the air over the big chip.
Use RTV silicon caulking compound to glue them to the 54's motherboard.
This presupposes you have a soldering iron and a voltmeter, or at least a soldering iron and enough knowledge of power supplies to tell where the filter caps are.
I've got a stack of 54s and non-wireless BEFSR41s and putting a fan inside makes a world of difference.