I subbed buttermilk for regular, used a lot more lemon juice and zest , I didn't measure, just
kept tasting the batter, cut out the almond and used about 3/4 tsp baking soda.
They are delicious, especially with Gayle Gand's buttercream icing, also with a lot of lemon juice and zest.
They didn't dome as much as the single batch I made a couple of weeks ago but the crumb was still light and airy.