You are betting that a 2/3rds majority of senators and congressmen override a Trump veto. Do you think that 75 GOP congressmen will join with 213 Democrats to overide a Trump veto? Actually, the real question is how long will they let the US economy bleed-out before coming to their senses.
Think about the psychology of congressmen: if a pro-Trump GOP rep is on record supporting Trump's tariffs in a vote in April, and the US economy crashes Great Depression style May to July, is there anything those congressmen can do to keep their job in the next election? Probably not. Therefore there isn't a strong incentive to change their vote post-crash because once they go on record in favor of Trump's tariffs they are basically doomed electorally anyway.
Congress/Senate might realize this and wait for the public to feel some real pain before allowing a vote to give GOP members cover. But I think it's fairly likely that if Trump doesn't get scared by the stock market dropping, we are facing a further 3 month (best case) to 21 month (worst case) period of tariffs or virtual tariffs (that are priced in based on Trump's unpredictability).
Of course, that's speculation but the point is that there isn't an effective check and balance for Trump on this currently if he really is this crazy.