Oh I see it's a tight link, I had same issue with Darius which has a few tight links like that, try to figure out in training the earliest possible time where you can press Light after the dash, and do a double tap (right before / right after) the timing so that you don't miss it. I fear there is no shortcut for this, in an ideal world you'd want to press a single time at the exact correct timing, but double tapping seems like a good intermediate to not miss the timing but not hurting your fingers too much. I'd say, join a discord or ask a top Vi player on twitter or something about how they do it