A couple of things: Before I went looking for new shocks, I intended to have the end caps on mine chromed, but there's no obvious way to dismantle them without damage. Maybe you can figure out how to take the caps off and then re-assemble them without ruining the shocks but I couldn't.
Also, I'd be surprised if you get 50K out of set of shocks. My whole adventure on shocks began when mine seemed to be bouncy at 21K. They had definitely lost some damping ability. The difference was especially obvious when I installed the new shocks. Now, I have no idea what shape your originals are in at 10K but I would think they would not yet be as soft as mine were at 21K, so you may be right about having life left in them. But now we're back to the re-chroming thing.
If you do figure out how to dismantle them, be sure to post some photos. I'd like to know how.
I'm just stating my experiences .... not trying to start anything
I have over 27K miles on my stock rear shocks on my FXR4. It is my current opinion, based on past experiences with riding skooters for the past 35 years, that I still have 15+ thousand miles of life in those shocks.
Now, having said that ... I do set the pre-load on the heavy side, because I like to have the bike STICK in the twisties and high speed connering. I VERY RARELY set the pre-load on a 'soft' setting. I have no idea if that has anything to do with the longevity of the shock or not.
Also, having said that .... Do I think that I would be able to tell a difference in the ride, and MAYBE, the handling if I installed new Progressive 440's

Sure, I bet I'd notice a difference. However, having said that .... I do not feel that my ride or bike handling is compromised by the shocks that are on the bike today with 27K miles on them....... could be better, SURE, necessary, not at this time in my opinion.....