Don't let these two guys ANYWHERE near your Jeep and they can't install their shit.
Sorry, but they don't need to
Letting the opponent captures a piece without any tradeoff is a huge mistake, not small mistake. So I would say for top-notch players, it's rare for one side to have majority of pieces that easily.
The unit promotion mechanism also makes no pieces really "weak". Unlike internatioal chess, pawns don't need to reach the bottom to upgrade. Walking 2/3 of the board will do.
I always liked the Shogi variant of chess. Other than a slightly larger board (9x9), and a few more pieces (20), you also have unit promotions, and deployment of captured pieces. The deployment of captured pieces especially keeps the late game from becoming simplified.
This just turns a draw game into an endless game. Since captured pieces are redeployed, there will be no "true" late game if both players are skilled enough and make no big mistakes.
What ever you want is going to cost a little more than it is worth. -- The Second Law Of Thermodynamics