This one says it has no lanolin.

There have been a few postings on r/Goodyearwelt of people using coconut oil to condition boots. Food oils are generally a bad idea to use on leather or furniture because they go rancid, but I guess coconut oil is more stable than most? You could try asking over there for ideas, they are really into leather footwear and know all the products, but make sure you ask in that day’s questions thread or you’ll get deleted.