Trying to combine two transformers has all kinds of problems. Ranging from proper load sharing to phasing problems.
Now you can get 20 VA transformers at a reasonale cost.
http://electrical.hardwarestore.com/15-57-doorbell-buttons-accessories/8-16-24v-20-watt-transformer-621043.aspx
http://www.eztone.pro/ezs-wire-transformers.htm
That said, I have not check out the specs on the chimes. But if they are the simple Ding-dong type and you don't have kids that lean on the button for several minutes at a time I suspect that you can run two off of one transformer.
If it fails then replace it with the larger one.
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