Some people are looking for ecologically-friendly rabbit litter box solutions. One solution is a non-absorbent litter in a drain-through litter box. The Smart Cat Box caught my attention when researching; it is filled with whole safflower seed. Granting the claims of the manufacturer and assuming the system works well, what advantages and disadvantages should I consider when using a safflower seed litter box with a pet rabbit?
My main area of concern is that safflower seed is a feed product for rabbits. According to feedipedia, processed seed has been used with good results in production rabbit feeds. According to Wikipedia, the whole seed is a good bird seed because squirrels don't like it. The whole seed is an ingredient in at least one pet rabbit feed, but it is not an ingredient (processed or whole) in either of my two, favorite quality, pet rabbit feeds 1 2.
So, could presenting a litter box full of whole safflower seed, be like presenting a bath tub full of sugared cereal to your child, or might they ignore it completely, or should I expect something in-between?
In particular, I'm looking for answers from experience on rabbit consumption of whole safflower seed (the type used by the litter box), and/or research on the long-term (8 - 12 years) digestion of large quantities of whole safflower seed by rabbits (alternatively demonstrating that a rabbit cannot digest a whole seed).