It would take lots of work rewriting fluff etc. but I found myself wishing the WFRP core system had been used for the One Ring tolkien game (chaos star becomes eye of sauron, comet becomes gandalf rune). I loved One Ring's attention to detail but found the resolution system not offering enough player options etc.
Have you run/played it, or is this from reading the rules?
I've been running both for a while now and I haven't found the One Ring lacking in the least.
Check out both podcasts at Reckless Dice.
I have run One Ring, and the table all found it flavourful but lacking in mechanical choices for players compared to WFRP, both in combat and out of it. I posted at cubicle 7 forum about our experience. Good roleplayers can always roleplay of course but a system should support that and encourage it, not simply rely on it. This verdict comes from a table 5/6ths Tolkien fans, two of us having read the history of middle earth series, several having once tried MERP etc. as said , I do love the detail in OR, the way every trait etc. is anchored in source material, the beauty of the art etc.
I plan to keep buying the product line but feel a WFRP hack or the Mouseguard hack some use might be better system. For example, WFRP corruption points can be revised into shadow etc.