I had a Goldthing once too.... For you KJ, stay away. With an FJR and K16, this is going to be even more of a pig than the K16. Why won't the K16 be the touring bike I would ask........ I say save the dough, and do not rent one.
That said, the GL can be turned into a very capable sport tourer by spending money. First on that mush of a suspension (Traxxion being the best and most expensive route), because it needs better springs and some ground clearance so you don't drag the hard parts. Second, tires.... on that bike, I thought Avon Cobras were the best (hint, put a taller 70 series Valkyrie size tire on the back for ground clearance and improvement to the handling, speedo error fix, etc.). Or, of course, the car tire does great on that bike.
Third, you are going to need better ergos, i.e., a taller seat, handlebar risers. You'll not like it stock because of your height.
But, no matter how you fix it up, it's still a 900 pounder. I did my best back in the day to keep up with ST groups, and while you can do it, it's a bit of work at the end of the day. The GL was meant for covering lots of ground while having very reasonable amounts of fun in the twisties.... but I don't think it's for you. The K16 will be much better IMHO. Save yer money.