There are many conceivable ways to map 140edo onto the Lumatone keyboard. However, the Standard Lumatone mapping for Pythagorean is not one of them because there are two mutually-exclusive rings of fifths. You can use the b val fifth, which is slightly flatter than 19edo and an excellent generator for marfifths. Note that due to the size of the edo, this does still cover less than half of its notes, but you can access the better third and fifth by zig-zagging three steps down from the slightly flat ones, making near just 5-limit chords accessible in quite a few keys.
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If you want to be able to access the full gamut, the 15L 4s kleismic mapping is probably the most efficient and intuitive layout, although it doesn't even reach two octaves.
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The undim mapping is also fairly efficient and quite easy to navigate if you're used to 12edo, each horizontal step offering a different flavour of semitone while making comma shifts easy.
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