QTR-Quadtone RIP

I want to use newer papers (the Harmon Gloss and possibly the Hahnemuhle fine art pearl) 
with my Epson 4800.  Looking at some of the other curves available for the printers people 
are profiling the Harmon paper for versus the 4800 it looks like there are considerable 
differences so I doubt I'll be able to start with someone's curves for another printer and get 
close enough by eye.  It seems like maybe there aren't so many people out there using the 
4800/7800/9800 with QTR so the set of available curves is not as large as for a lot of other 
printers.

I don't own a reflection densitometer.  Browsing around eBay I only see a few affordable 
choices -- the X-Rite DTP32 or DTP34, or there are some X-Rite 404s around but those are 
RGB models; I don't know how that will work.  It looks like at least the DTP34 requires 
software to get any readout at all since it's USB connected and seems to have no display.

What can I use to make curves that's cheap and will give me better quality than my scanner?

Thanks!

Thor