have you tried changing the PTANGLE to vertical and then ptoffset it to the required spot and using STRAs? its not ideal and definitely rubbish but its always something.
also you could try using a SLAB or GLAB as the projection line text
Im doing the method mentioned above drawing lines after required ptoffset. It is consuming little hours and when change in drawing limits need to be rearrange all these lines again to its original position.
All I expexting Mr.Rauv can help me out with some macros to do this process automation.