You don't need an input diode for reverse battery protection. You can use a fet. This is a no-brainer if your low-battery-voltage operating-current is above half an amp or so.
Sepic seems easier to keep rf-clean. You have to use a boost controller rather than buck but with modern ceramic caps it's fairly plain sailing.
You mentioned that no diodes are needed. I assume you were referring to flyback diodes since you have a synchronous output. However, automotive also has a reverse battery requirement which means adding a diode in the battery feed, unless the LT8610 has reverse voltage protection. This adds a diode drop at all voltages and means that the low end battery voltage is now 3.7Volts (assuming we can use a schottky diode). USB charging and data application require 5Volts. We really need a buck-boost supply.
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