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I'm happy with the products I've purchased from Blue Sea, I used the fuse block linked bellow to replace the 12v block.
https://www.bluesea.com/products/7725/SafetyHub_100_Fuse_Block
About fuse size, I don't know enough to tell you what's best for that scenario. Hopefully a member in the know...
I may be mistaken, it certainly wouldn't be the first time, but AFAIK, m38inmaine's only replaced the top alt. with a 12v Leece Neville (110-555JHO) leaving the bottom alt. to satisfy the 24v needs and ChevyC60 replaced both alts with the 12v Leece Neville (110-555JHO).
So your diagram would be...