Try cross processing?
Don't expect great results. Ideally, use it as shelf queen decor. Don't risk it for valuable images. Try cross processing. Recently during a cleanout at home I came across a long forgotten metal container with TWENTY, yes, 20, rolls of Ektachrome 120 films put away around 2000, and completely forgotten. Doubt it would be any good for slides. I shot one roll at box speed in my Rolleiflex T with 16 exposure kit, cross processed it in C41 in my Jobo with already well used Tetenal C41 chemicals, and... wow, the results. Weird and wonderful colors. Have one print of our cat on the wall, wild pinks, lime greens, fuschia eyes, red teeth. Hollywood Technicolor gone haywire. So why not try it and see what you get? to me, unexpected results are half the fun of film photography.