Yes, this is fine. You can edit trips in the past, to reflect the trains you actually took, rather than the ones you planned to take. I frequently do this, and edit trip planner while on the train. You just need to make sure you have a valid itinerary to show the guard, although as long as you have any journey valid for today, you’ll get a QR code. For the Eurostar specifically, just get off at Brussels. Don’t ask for permission, or somebody might invent a reason to say no! i would do the same as you. Edit the planner after you arrive in Brussels. That’s great, thank you!
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