Replace a swing with a swing. My budgies love their swings so I have several hanging around. Their favorite is this chunky cheapo shell & wood swing: https://www.amazon.com/Penn-Plax-Bird-Life-Shells-Swing/dp/B083Y6X3F4 I think I got mine at walmart.

You can also try a swing that's meant to be shredded: https://www.amazon.com/Kabob-2-Inch-Carnival-Chewable-Perch/dp/B004TS2JEO/ref=sr_1_3

If the top of the swing is the highest perch in the cage, move a regular perch up there and they may prefer it to the swing.