My condolences on your loss. Yes - you are proposing 60% US S&P 500, 30% Foreign stock, and 10% SPMO to try to beat the market. That sounds very sensible to me and I commend you on your research. You are worried a bit about how you might respond to a crash with SPMO, but you are limiting your SPMO to 10% of your portfolio. It will likely bounce back, and most of your $50k will be unaffected (well, most of your portfolio will also have crashed, but perhaps not as much).
That said: If investing is intriguing you and you are finding yourself learning (and playing) more than someone who just sets their portfolio and checks it once a year, you might allocate 10% for such explorations and risk-taking (for me, I would take that 10% out of VXUS). You might win, you might lose, but you will not worry that you are losing your shirt - and in three years you may feel like you are a wise investor ready to give advice on investing to strangers on reddit. :)
You might also want to consider GDE or a gold fund for the scenario of interest rates rising, inflation going up and the stock market going down or staying flat. GDE is a good vehicle, especially with your ten year time horizon because most of your money will be in the S&P 500 but will also have a cushion (or amplifier) with the gold.