They are highly engineered hybrids if I'm not mistaken. While I recall someone posting a few years back that they were going to try what you're proposing, I don't believe they ever came back to share any results. If you do try it, please let us know what happens in subsequent years.
One alternative that could work is growing out a rootstock plant and taking and rooting suckers from it. You would just need to time it so that the sucker have time to set roots by the time you're ready to graft.
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