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I'm thinking there is not too much reference about RPI4, but maybe should be similar from this case like RPI3+. I had lots of them, and It's really easy to push down the power hungry to around 1-1,5 amps (with full CPU). The key, you should disable HDMI, Ethernet and other non-used services. And don't forget, it will not run with full CPU for long hours. In idle it's eat around 500mA (RPI4 is around 650mA). I'm thinking it's safe to use with this buck converter. You can add a heat sink if you really want.

I more worried because the HF noises. Just for safe better to add a high frequency cheramic capacitor between rpi and the buck converter, because rpi using a switch mode buck converter too for make the 3V3, and the big 24V PSU are a switch mode power supply too. 3 piece of switch mode power supply in linear could be really noisy at the end. But these are really tiny, you can directly solder to the output of the buck converter next to the wires.