I don't know the Lidgard 29 at all...but it sounds like it first had rigging replaced at only 8 years old. Is it a racing boat, and thus with higher stresses on the rigging? Or mainly recreational, weekend use? Makes a difference.
I think this rigger is just trying to drum up his own business. Once the mast is at his shop, he can come up with all sorts of: "Well, since the mast is already here, we might as welldo this...or do that"...and before you know it, we're talking big money, when all it maybe needed was inspection and a couple new tangs, maybe.
If he doesn't feel comfortable with an onboard rigging, "up the mast" inspection, then what's he a rigger for, and perhaps you might want to get a different rigger. Or as someone suggested, study some rigging books and do your own work...it's not really all that hard if you study.
"...and a star to steer her by."