You can try making a mouse-over macro for Play and see if that helps with KB+M. You can hover over the player's name in your party list with your cursor and deploy the card, and you shouldn't have too many issues with it queuing up.
I play on controller and got used to targeting members in the past for single-target cards because controllers can soft target a party member (using the D-pad to manually scroll through the party list during a cast and highlighting the desired party member without pressing X to hard target them), deploy the card, and then go back to attacking the boss. After practice, it's not that clunky to do at all, in my opinion.
That said, I'm still not a fan of the cards or the seals. They're living up to the prior expectations I already had of boring gameplay with very little decision-making involved, and I usually have my seals for my next Divination well before the buff is even close to being off CD (even without Sleeve Draw in sub-70 stuff).
