Cold stitching
Cold stitching can work. If you look at the web guidance nowadays there are fancy tapered taps and plugs available which look really good.
Nearly 50 years ago, I did a similar crack in the low-tech DIY way, with brass rod and ordinary taps and dies (probably 2BA) with overlapping plugs set in with Locktite and peened over with a little hammer. Seems to have held up OK since then (though, to be fair, the car was in the garage for a very long time in the intervening years).
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