For tournament play...Both 4p games...
1) 2 randomizers (cards) are dealt face up in front of the table. These 2 will be 2 of the cards in the Kingdom. Then, each player is then dealt 5 randomizers. They each pick 2 to put out in front of them face down (so that all 4 players can select them simultaneously), while the other 3 are put back in the box. 1, 2, 3, flip them face up. 2 cards times 4 players + the 2 randomizers on the table = 10 Kingdom cards.
One game, mucho cards in the $5 range. Next game, mucho cards in the $2 range, since it appears we all got 'panicky' about having too many expensive cards and not enough cheap ones
2) 14 Randomizers are dealt face up in the center. Going in reverse order from the last player, (or was it in turn order from 1st player?), each player vetos one card so that after all players have vetoed one card, you're down to 10.
This way also makes the game take longer, as this beginning setup part is a game on its own.
other ideas, untried...1) Thunderstone-style
Shuffle any Victory cards into the "Dungeon Deck". The "Dungeon" contains 3 slots, from slot #0 through slot #2. Purchasing the cards in slot #1 and #2 each 2 and 4 extra coins. If you spend a +buy, then you can get a $2 discount on slot #1 and slot #2, and $4 discount on slot #2 of you spend +2 Buys
All the rest of the cards, non-Victory ones, form the standard Kingdom layout.
2) Ascension-style
Have a Center Row of 6 cards. When a card is purchased, it is immediately replaced another one form the "Portal Deck". The Always On cards include Silver and Duchies, but no Gold nor Provinces. Gold and Provinces are mixed in the CR. Keep tabs on when the appropriate number of Provinces or other Victory cards have been purchased
3) Nightfall-style
8 cards in the Kingdom.
Each player has 2 "private Kingdom supply piles" only they can purchase from. For simple game, make this random or a preset. For advance games, follow the drafting rules in that rulebook.