I'm almost 53. I'm taking voice lessons as a beginner and I love the idea that I can improve my voice and enjoy singing. I asked my voice teacher if she thought I would benefit from playing an instrument as well and she said yes. She recommended the piano (electronic keyboard) as the note placement is linear (hope I'm making sense) and I don't have to deal with getting the notes to sound right as I would with a string or wood instrument. My voice teacher refers to herself as a "piano hack" and doesn't have any advice on how I might learn to play the keyboard.
I'm taking two hour-long voice lessons a week and I don't want to commit to regular piano lessons. And, I have no desire to excel at piano. I want to be able to play notes, sequences, scales, and someday some songs to help me to hear notes and match pitch. I was a math major in college so I have no doubt that I can learn the music theory I need from a book, course or website.
Given my story and goals how would you recommend I learn piano? I've read cautions on the web about the importance of piano lessons but my interest in learning to play is fairly limited.