Your question can be answered easily but it may not be the answers you want to hear. Many have thought as you of grafting apples to pears. Many more have believed they were successful. There are what are known as interspecific hybrids some of one tree and another. There are some apples such as winter banana more compatible with pears than other apples. There are many who have tried to graft apples to pears with success @Auburn @39thparallel and many others. All of this said in my opinion I’m not sure it should be done. I question if such as orchard even if grafted using interstems could ever be fully productive. It’s my opinion it would be difficult to find a working combination which would take time. Many times I’ve grafted winter banana and many times it’s died of fireblight. Perhaps others will have suggestions and experience different from mine. After all consider I’m partial to pears so my opinion is biased for that reason as well. You can easily take cuttings and root them. Most times when apples are grafted to pears they grow poorly and die after several years. You might like this topic Interstem aka interstock Pear Grafting and this one Compatibility grafting? - #3 by clarkinks
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