I have been using s 27t-47t double on a couple bikes. The cassette was 13-32, or maybe 12-32, 8 speed.

The system worked, but at it happened the most useful gears were on the large ring and I tended to avoid the overlap gears on the smaller ring because there was so little chain tension there. Occasionally the front derailleur would drop the chain completely when shifting down to climb a hill.

I have now replaced the 47t ring (the one shown above) with a 42t ring. On a similar setup I was able to find a 44t ring: