What about just something like this?

TITACUTE USB Type C Anti Dust Plug 2 Pack, USB C Port Plug Dust Cover with Mini Carrying Box Note 20 Dust Cap Plugs USB C Port Caps Protectors Compatible with Samsung Galaxy S20 OnePlus 8 Pro 9 9 Pro https://www.amazon.com/dp/B085T5L9T6/ref=cm_sw_r_apan_glt_fabc_ZS7CXG18MGF7T674THBP