From your description it sounds like your line from the bathroom is 3", and you want to use a septic field that is higher in elevation than the workshop bathroom. I suspect you will be using a sewage ejector pump, not a sump pump. The sewage ejector pump accepts sewage from a 3" line, chews up solids, and then ejects through a 2" line. I believe the 2" 'T' your tank installer used is correct. You will also have to be sure the ejector pump is vented. I would buy the proper pump and determine pipe sizing before you invest much time in plumbing new lines or ripping out old.
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