Giving this thread a quick bump as I'm researching the Mackles of the area. I thought I'd add my info just in case it was relevant to your search.
My 2x great grandfather Henry Mackle is linked to a couple of the same areas as your search.
He married a Sarah Tomlinson of
Ballymultrea in 1871 (wed at Ballinderry chapel). He was living in
Bellagherty at the time. Both are places that I note are linked to the Lees. In fact, a number of Ezekiel's children were born in Ballymultrea right around the time Henry and Sarah wed, while she was still living there - so I think it's likely the couples would have crossed paths.
Henry and Sarah's children, along with places of birth:
John Mackle - (b. 1872, d. same) Bellagherty
Henry Mackle - (b. 1873) Bellagherty - married a Mary Jane Mooney in Glasgow, 1902
Joseph Mackle - (b. 1875) Ballymulderg - twin of Margaret Jane
Margaret Jane Mackle (b. 1875) Ballymulderg - twin of Joseph, married Hugh Conway 1903.
Catherine Mackle (b. 1877) Ballymulderg
Sarah Ann Mackle (b. 1881) Ballyrogully - married William Mooney, brother of Mary Jane in the Loup, Magherafelt district, 1905.
Bridget Mackle (b. 1883) Ballyrogully
Mary Mackle (b. 1886) Ballyrogully - married Patrick O'Neill in the Loup, Magherafelt district. (<- My ancestors)
Andrew Thomas Mackle (b. 1889) Ballyrogully - apparently intellectually disabled in some way, according to censuses.
Now despite living in the Loup, the family did still have some links with Bellagherty come the time of the censuses - Henry and Sarah's daughter Margaret Jane, listed as Maggie J, is working as a servant in the house of a John Mc
Kee in Bellagherty in 1901 (was he anything to Mary Mc
Gee?).
My thoughts immediately stray to the possibility that one of the Mackle sons may have been the father of the two Lee girls - though I suppose it would be impossible for us to confirm it. As John died in infancy and Andrew Thomas was too young it would only leave Henry and Joseph as potential candidates. Henry obviously left for Scotland and married there. I think Joseph may also have emigrated, but I haven't had the chance to look into it.
There's also a bit of a mystery as to where Henry Mackle the elder and Sarah Mackle (née Tomlinson) are in 1901. They are both alive at the time of the census, but not present in their house in Ballymilligan, Loup. Only two of the daughters plus Andrew Thomas are there.
I hope the above might help you dig up the elusive link to the Mackles!