OK just had a quick look at the xml and you dont have home switches so you can use that to your advantage.
If you make sure you are in G54 then jog and touch off a point with the scribe, press RefAll then Zero the DROs, next change to G55 and move the torch to the same point then zero the DROs and thats you set. Each time you want to start a new file from a different location just jog to where you want, make sure you are in G54 and then press RefAll and then Zero DROs. That will set the G54 and machine coords zero and your G55 will have already been set by the first time you did that so no need to re set the G55 offset.
Hood