I doubt your "endgame repertoire" idea is going to hold water.
My reasons:
- An opening repertoire is really only designed to get to a playable middlegame with equality at worst and an advantage at best. Whether this advantage carries over to the endgame is a factor of how the game progresses .... nobody coasts on auto-pilot towards a "advantageous endgame" even if they go about trading pieces willy-nilly. You're giving your opponents far too little credit.
- This whole notion of "beginning your fight in the endgame" reads as INFLEXIBLE. A strong opponent will probably destroy you in the endgame to begin with BUT is ready to mutilate you in the middle game or even right out of the opening. He plays the board, he plays the position and not to some "fast-forward 20 moves and then I'll play chess" mantra.
Now if you are instead designing a repertoire to help you against tactical monsters such as computers or the pint-sized prodigies at your local club, you'd probably make more sense. You can hand-pick lines that give the game a less sharp feel to it ... giving you adequate time to realize a plan in the early stages rather than have your opponent go for your throat within the first 10 moves.
Update: There may be one instance where the OP's strategy will work => Playing inexperienced opponents (usually kids) who never had the time / patience to work on their endgame. In this instance, I'd think dragging them kicking and screaming to an endgame(however dry and boring!) may help you as they'll be more likely to misplay it than you do. Though this is still an exception ... you can't assume things about every kind of opponent.
Have anyone been able to create an endgame opening repertoire for white AND black ? An opening repertoire that has the goal to reach an endgame as fast as possible. Hopefully with the aim of playing for the win from a very small opening advantage ? ("Play for the win with the draw in hand").
I hope the collected knowledge in this forum could lead to interesting answers.
Some thoughts : Should the best start for white be 1. Nf3 ? As it can transpose to different opening likes 1.d4, 1.e4,1,c4 ? Or should one opt for 1.e4 or 1.d4 ? This is a very interesting topic. Some people may find it boring as they aim for Kings Gambit/Morra Gambit/BDG attacks at all cost. I am different. I can take a draw as white. Thats OK. But the slightest mistake by my oponent will be severly punished and I love to win a long endgame battle.
As black I think that against 1.e4 I go for the Caro-Kann and against 1.d4 I play the solid QGA. Both are quite solid choices but against the caro I feel that white can seek complications (panov and advanced variation for ex) so maybe the french is a better choice here ? French (dxe4 and Burn variation) and QGA ?
Against the english 1.c4 I play :
1.c4 e6 aiming for the QGA if allowed...but that is rather tricky. English opening is very flexible so it is not easy to go for an endgame ...or ?
1.Nf3 d5 going for QGA if allowed.
So there are many ideas and variations to choose from. The problem is to get it all together and create an endgame repertoire. A nice thing is if my oponent can be as restricted as possible. If I play 100 games against him ..I hope that he feels that he is sitting and playing the same opening over and over...and also finding it rather difficult to escape them.
Shoot!