Hiya, im type 2 diabetic. I use Flexitol, its absolutey brilliant.. its a moisturizer especially for heels. You can buy it over the counter in any chemist.

I have Hashimoto's and hypothyroidism that leave my feet cracked all the time. I a m always looking to fix them.

Flexitol is an excellent product. The podiatrist sell it!

I haven't diabetes but a few years ago I had terrible splits on my heels. The only thing that worked was the cheapest. "Cracked heel" cream, I used it for a week and it healed. Just over the counter cream.

The one from Aldi is just £1.99
In the reviews a person says they have diabetes, and it works great. Many 5* ratings on the link below.
I hope it helps.

https://www.aldi.co.uk/pedicare-cracked-heel-re...?

Feet can be a serious problem for diabetics and should be checked regularly
Cracked heel cream is good for non diabetics but I would consult your diabetic nurse