Knowing where on planet earth you are would be good information for finding an arborist that would be willing to do this work for you.
Selection of best fit root stock is also a matter of location as well as growing zone.
So far there are no elms that actually resist DED, there are a few that can survive it but I have not found any references to truly resistant trees that are suitable root stocks for elms.
Also, when it comes to DED, trees other than Elms are effected by this disease which is why there are some folks working towards deriving a resistant strain of elm, as far as I can find they have not be successful as of yet, there is promise of getting there though.
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