I'm guessing your crank is 130BCD, in which case 38T is the smallest ring you can run, and it wouldn't make a big difference even if you could find one.

My vote would be to switch to an 11-28 cassette, find a double with 110BCD (old or new), and use 46/34 rings. You'll gain more low-end, the RD should be happy, the FD will be able to handle it after lowering it a little, and the top gear will be about the same.