Well I had an idea but never tested it though since I didn't have any oppontments to play with.
It's more of an answer to your oppontment instead of a handicap.
If you play for a 750 points match you can keep up to 25% reserve forces of your liking which you can swap between games.
Eg. you play uruks with no pike support and your oppontment plays riders of rohan, in the first game the riders trample your troops.
In the second you bring in the reserve troops by swaping them for something else which proved to be useless in game one and with this you win the game.
This is my idea, never tested though can can test it and give me feedback