It wouldn't hurt to have the level cap for mission BC's, and even some mission area's. The optional reward could be Sparks of Eminence, and that would also allow all the people who completed those missions back in the day to tick off those Records as well.

Otherwise, as fun as it seems, there were some parts of CoP that did take up a lot of play time, and were amazingly challenging.

When it comes to say the Airship fight (the most challenging CoP mission by far) after a few trys i'm betting you would just scrap the level60 cap and run through it. I remember that fight well, on our 6th or 7th attempt we lay there wiped, double weakend, with Ultima or Omega? I forget which at 1%HP and frustrated, then all of a sudden after 30secs of us all laying there wiped the mob dropped down dead - our RDM had landed a Bio on him and it dropped with us all wiped. It was a memerable feeling but,

From someone who loves a challenge, if the option is there to fight a battle like that uncapped then chances are you after a couple of trys and spending time gathering items needed for the fight you probably will just think 'F-it' and burn through that one forgetting all about it.

Even now, having just returned to the game after a 3 year break, I'm enjoying solo-ing content like Dyna, Limbus, Campaign Battles then VWNM's and Walk of Echo's for getting the WS's for my 4 jobs. I haven't even downloaded the Seekers edition to play Adoulin as I have far to much to do to take up my time, and I know once I have Adoulin I'd be stuck in skirmish and Delve so enjoying these other aspects of the game to the max first is fine with me, I'd like 4 emp ws's unlocked, all the Dyna+2 gear, and AF+1 gear and WotG storyline complete before I move on. Some of it is a doddle (95% of Limbus) but then other things are challenging (tierII+ WoE) solo so I enjoy a nice mix of easy and hard.