House advantage of this BJ-variation?

In Austria, a strange variation of BJ is offered.
The game is called "two aces"

The best hand is not 21, but 22. So you only bust if you have 23 or more.
If your first cards are two aces, you are paid 3:1
Dealer draws to 16 and stands on all 17's.
Double on 10,11,12 only and DAS.

Can anyone tell me the house advantage of this game and a correct basic strategy?
Thank you.