Howdy!
First of all - thank you for contributing your suggestion! After considering it, I would have to disagree as the burninglands is intended to be the most difficult of all the isles, so it makes sense for the gradual increase in risk of losing your items. I totally understand where you're coming from, but I think it reduces some of the challenge/appeal to them if it were to become like the levels below it.
An additional suggestion could be to add in a totem that - when in your inventory - will prevent you losing all your items when you die in the burninglands, but you lose the totem afterwards (like a one-use thing). This could possibly be purchased in /kilton for example for a fair amount of souls.
Have a nice day/night!