You've been playing long enough to know which holes you can draw bend and which holes you can blow bend. I don't think playing a valved harp would confuse you.
I had some valved Promasters. I liked them at first. It was great to be able to get those extra note (though I didn't use or need them very much). But they rattled and I ended up pulling them out. If they wouldn't rattle, I'd love to have the valves! I can't overblow/overdraw, but with the valves, there no need to OB or OD.
Here's David Barrett and PT Gazell talking about valves:
[video]http://www.youtube.com/watch?v=x3DfG_Ay8Ek[/video]
Maybe you could put better valves on, yourself. At the end of that video, PT says something about Seydel (pronounced SI' dle...Kinda like "saddle."
having good valves that don't rattle. I looked it up:
Click.
I don't know the width & length of the reeds, so I don't know if the Seydel valves would fit on a Suzuki, but if they do, here's how you'd put them on:
[video]http://www.youtube.com/watch?v=So1HWuIyU6E[/video]