You can download the inventory files to get the silver/dragon armour back. They will morph, but everything gets reset when you upgrade them anyway.
Lost Items - guide and directory of inventory files

You could use iZakaroN's SaveEditor to give yourself skill points to make up for the lost bonus spells. I had a a three items with Repair, one with Identify, three with Trader's Tongue and a couple with PickPocket.