You will do no harm in changing it at 50 with fresh break-in oil, and it sounds like it will put your mind at ease as well so go for it.
I agree Brian.IMHO, your break in is done at 50 hours and its not worth running a lesser grade oil than what you would normally run.
My manual specifically states hour intervals or yearly which ever comes first.FWIW, changing your oil at least every year should be minimum requirements in my mind. :drinks:
I don't think I've ever heard of anyone changing the filter at 10 hours. You'll need to add some oil after the filter change and one problem you'll have is Deere break-in oil is only available in one gallon containers or larger. I'd ask your dealer if he could give you a pint or so of break-in oil to use after the filter change. Otherwise I'm not sure what you'll do with almost a gallon of break-in oil that you'll have leftover.
My dealer actually recommends doing the first service at 75 hours. I purchased the filter kit and oil and hydraulic fluid, and plan on doing it myself at 50 hours on my 2520. I'm up to 38 hours so it will only be another 2 weeks or so until I do the service. I've been working the tractor pretty hard, so I'm going right to the Deere synthetic oil.
As a side note, my dealer said you could extend engine oil change intervals depending on the oil used. Online Deere literature also states this. With Deere Hy-Gard, I think you can almost double the interval.