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Going to strip them back, use 'leather filler' on the cracks and dye.
I think you could achieve a really good result. The leather is quite thick. Nothing bad will happen if you remove the top layer with wet and dry paper. Start with 100 grit and finish with 1200. Then put on a new finish with a pigmented layer (dye or paint) and a lacquer e.g. https://fiebing.com/product/resolene/ or https://www.angeluspaint.co.uk/c-9-finishers.aspx . Fiebings and Angelus have about a billion choices for you.
The hard part will be getting the filler to stick and making it look like leather! I'm looking forward to seeing your result! Here's some inspiration https://www.furnitureclinic.co.uk/leather-repair-kit I can't find an example with deep cracks on shoes. You might be the first to attempt it.
Yeah just about to pull the trigger on some, just checking with the sellers that they come with those little plastic stretchers as I have weird shaped feet and could do with stretching them out a bit more in a couple of spots even after more than 6 years. Would have saved myself a lot of pain if I'd just bought them with the boots tbh.
Going to strip them back, use 'leather filler' on the cracks and dye. Maybe I'll get flack for that on here but they have seen some abuse and hopefully this will bring them back a bit. Lesson learnt.