Proper leather shoes

The boots I use are meindl 3 season boots and I'm still getting cold feet. I've ordered some felt liners from an army supplies store (new), hopefully these will help.

On my +100 miles rides I can be out in the cold upto13 hours depending on the climbing (AAA) routes so I'm slow.

Are these boots for bicycling?
Cycling has VERY different demands as the foot is being held quite firm in the pedals. Using cycling shoes, layers of wool socks and over-shoes helps but... I've gotten feet so cold that...
The only solution I currently know is heating. There are a number of new smart heating units on the market that work well and fit into most cycling shoes. With LiPo batteries some models can run of to 12 hours.