Understanding how the practical elements of an industry/problem scenario work can be useful context to analysing the legal risks or issue thats in your in-tray. That's pretty much how your background understanding of Tech/IP might help - no different from any other career move into a new field, you draw on the cross-disciplinary skills and info you've learnt.
GDL absolutely not a disadvantage on the other point btw.
I don't want to be overly pessimistic but I do think a decision to try for the bar has even more at stake when you're established in a career already and the time required to be spent on study, mini-pupilages and work experience can mean cutting your current role for a couple of years, with no guarantee of pupilage at the end of it.
Definitely recommend looking at the CVs of the most recently called barristers that do the type of work you're thinking of and give yourself an honest appraisal of how you stack up. Whether you become a fulltime student or juggle part-time in evenings and weekends the GDL is plenty of work, then BVC - then trying to fit in work experience, mini-pupilleges/work experience etc... - You really need to be fully committed. I don't think it's a cliche to say that the bar really is so-competitive in a way that I think few, if any, other professions match. I'm not at the bar (I'm a solicitor), but had three law school/uni friends become barristers - all three were incredibly bright & intellectual with a voracious appetite for hard work that put me to shame (and I am no strange to hard work and tough problem solving myself!)