Sean wrote:
"Any and all help appreciated."

Search on "spray-on zinc."

Zinc so applied can attain a thicknes of 10 thousandths of an inch. This
thicknness should be plenty at h-f, due to skin effect, for
conductivity. The zinc spray should be economical as it is used for
corrosion protection on large structures like bridges.

Best regards, Richard Harrison, KB5WZI