bluffing rivers multi-way IP

Let's say there's an MP limper who's 25/10, you iso from the CO for 4.5x with

BB, who is 20/5 calls, limper calls. Both will c/c any isd or better, overcards with an Ace and any pair at least on the flop.

Flop: (3 players) pot: 14bb

check, check, check

Turn: (3 players) pot: 14bb

check, check, check

River: (3 players) pot: 14bb

check, check, Hero: ?


Let's assume they will c/c any pair except for 8x, 99+ which they would have lead the river with, but they will fold Ace high or worse to a 10bb bet.

What if we have KJ?

I can solve that now with a pen and a piece of paper, but the real interesting part would be how the hell do I do that during the hand.