As of now there is no way to get tablet ui on kitkat. Google apparently removed the code. In previous versions the tablet ui was still there just not being used.
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LG G2 (Verizon)
HTC One Max (Verizon)
Samsung Galaxy Note 10.1 (2014)
Asus Transformer Book T100 64gb
Retired Phones: Droid DNA, HTC Rezound, Droid Bionic, HTC Thunderbolt, HTC Evo 4g
Retired Tablets: Archos 5, Huwaei S7, Viewsonic G Tab, Acer A500, Asus Eee Pad Transformer, Galaxy 7 Plus, Nexus 10, Nexus 7 2013., Note 8.0, Galaxy Tab Pro 8.4