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We used to use a large parallel test bar between centers with a dti on the tool post but with out a test bar spinning the dti round in the chuck while on the centre is a good indication of trueness.

Best bet is to use a centre in the tail stock to reduce push off (taper) in your job if the job is sticking out to far Or is a little thin, you can leave a little metal on the end of the job so you can put the centre hole in then turn it off at a later time. Oh the tail stock will need to be...

Carbide spot drill, I've always got an old one I use for broken taps/drills ,got to be careful because you dont want carbide stuck in the hole. Other thought is if you could drill from other side until you reached the broken bit you could hammer it out, had success with this method but only if...