My question here is why do you take the Uro away from its heat source to handle it? And how often/for how long does this usually take place?

I don't think the coconut fiber is easily digestible, but I would check with the experienced keepers/breeders before attempting something like that. They have have some insight as to why it is not used, or if it has ever lead to impaction or other issues with any Uro's that they know about.