Happy Easter All!

I have a dilemma, please advice needed. I am going to cook a large ham for
dinner and have decided this year to have baked potatoes and not mashed.
How can I pull this off? Ham in oven for 3 hours at 350, but the potatoes
need 1 hour at 450.
Do not want to use microwave we like the crispy skins when they are done in
the oven. I also of course want to make ham gravy.
Any ideas would be greatly appreciated my dinner is in 4 hours.
Thanks in advance.