You might try stainless steel fishing leader.
It’s available in single strand & 7 strand configurations in
diameters from .024" to .041". It’s available in 20 - 135 lb. test.
Local fishing supply stores may have it or you can try
jannsnetcraft.com coated & uncoated.
Their order numbers start at 311-667-020 for the coated &
311-660-020 for the uncoated.