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Putting live rock rubble in the canister = very expensive bioballs. It won't do anything different than the biomax media when used that way. The filtration benefits of live rock come from having it in a refugium-style setup-- submerged in a volume of water so it can denitrify and become a pod breeding zone. If you are going to use a canister, you should take all the media out of it and use it as a water polisher with high quality carbon and GFO that is replaced often.
The HOB idea is a good one. With a little ingenuity and creativity you can create cool little refugiums out of HOB filters. I've done it myself on my 10 gallon and had good results after a couple months of settling in.
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