Nice setup, Jack. The one downside to any kind of add-on forks...like the clamp on I have or the design you use (outside of the lifting point position that I already mentioned) is that there is still the weight of the bucket involved. So for folks you really need to use forks for as close to max capacity as there is available, the quick-attach setup may still be the better solution long term. FYI, the loader model number on the Kubota represents the total KG of lift available at the pivot point for the loader bucket. The weight of the bucket plus any add-ons comes out of that.
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The most expensive tool is the one you buy "cheaply" and often...