If you could roll maybe 74 dd...what would stop you from rolling up a new weapon? Oh wait...I forgot...your idea of compromise amounts to Jin players forking over hundreds of dollars for new weapons as all their existing weapons would instantly be made obsolete...you wouldn't want to have to spend a dime or put forth any effort.
If there was a merge, which there isn't going to be, the only way they could ever hope for it not to be the last straw for the majority of the Jin population would be to sell glacial upgrade stones for like, 75rps, with a 100% success rate in recycle system, that add 15dd, 100%hp, 120allstats, and 12% crit. But I'd put money on it you'd be dead set against those stats...because people that spend ridiculous amounts of time farming parts or tons of rps in the EM to get some very rare dual statted pieces, and get near perfect dd rolls, would end up with something a little better then the current best.
Don't set the bar equal to or a little higher so everyone has some incentive to regear...nah...set the bar a little lower, so you can still be on top...that's all you want.