You can send to Cash App or River using lightning and then withdraw to cold storage from there
Here is the nostr:npub1cashappn03s3cl2ljsdntv0v28e2um5lgx4vjctqjt23pcwzjhsqmtdg5l example ! Seems like fair and still in business. I guess River also does the same as cashapp following the network fees model 
You can send to Cash App or River using lightning and then withdraw to cold storage from there
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