Your slider is probably pretty big. For Raiden to access his cat enclosure, my husband bought a piece of thin plexiglass, cut it to the width of the window we were going to use. We had to cut the cat door down because it was supposed to go on a thick door. My husband cut out the opening for the cat door, fastened each side (with glue) to the plexiglass. Now we usually leave the window open with the insert in it. Since Raiden's enclosure is locked and completely covered, we don't have to worry about people getting in there or water getting in anywhere. When we need to go out of town, we remove the insert and close the window. Currently, the window rests on top of the insert. We also put some insulation board around so the air doesn't escape. If your door slides left to right or vice versa, you would need something taller. It needs to be rigid rather than flexible. It would fit into the track and the door frame when the door is open. And you remove it when you don't need it. It could take some creating, but it can be done.
This picture shows the cat door above the steps.
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