Diploma

Yes, you can get. The Lovely Professional University (LPU) Jalandhar is one of the University offers BCA lateral admission to Diploma engineering students. The eligibility criteria is as under. Eligibility: Pass with 50% aggregate marks in Diploma (engineering.). Good luck.

The direct 2nd year diploma courses eligibility criteria is as under.
For Maharashtra State Candidature Candidate: - Passed 10+2 examination with Physics and Chemistry, as compulsory subjects along with Mathematics/ Biology subject.
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You are eligible to seek lateral admission in Rizvi College of Engineering. But, you will have to go through portal of 'dte of tech edu' of Govt of Maharashtra.
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Yes, you can get admission in Reva university Bangalore for mechanical engineering.
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For better opportunities ahead, you can do Diploma course from NIIT. Good luck.

Yes, Desh Bhagat University authorised by UGC for distance B.Tech.
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Yes, you can get lateral entry for CSE after completing Diploma in mechanical engineering. Good luck.