Okay so, new parts have been ordered and the bike is at the shop. It should be finished in a couple of days.

Old: SRAM Rival 10-speed group set
Compact double crankset, 50/34
10-speed cassette, 11/26
short-cage rear derailleur

New: still all SRAM Rival 10-speed
Compact double crankset, 46/34 (swapping out the large chain ring)
10-speed cassette, 12/32
SRAM Rival WiFli mid-cage rear derailleur

The old chain should be long enough so they will probably only replace it if it's worn.

I spoke with several people at the LBS to confirm all this should work well together. Their answers were based on their own bike set-ups as well as some changes that they've made for customers' bikes.

And now after almost 6 years of using only the small ring, I get to re-learn how to shift.