I would like to ask is a good practice the calling of HAL_NVIC_SetPriority(SVC_IRQn, 0, 0); two or more times from different HAL_Init_*** functions in the main function ( before the endless cycle while(1) - or is this multi-call is necessary n optimized?

[Tesla DeLorean]

It's probably unnecessary, and the HAL really needs the ticker to preempt everything to avoid deadlock situation deeper in the library.