SC-FM-Umdanagar tripling is theoretically possible, except for few places there is space beyond the lines to lay an additional track. One big development will be to reconstruct MMTS stations which has only 2 tracks and no space in between.
Secunderabad Nampally will be a herculean task, atleast Necklace Road and Khairatabad has some space. But Lakdi ka pul is a huge bottleneck.
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I am also surprised on why Lingampalli is so neglected, there are new areas coming up around it and Lingampalli has the potential to become a prominent satellite station, yet even then there are so many Hyderabad/Secunderabad bound trains which don't stop there.