Sorry for the late reply: Safe and recommended, unless you use Jellyfin (which does not support the mainline Linux VPU driver).
packages=('linux-image-current-rockchip64' 'linux-u-boot-rock-5b-current')
dpkg-query -l | grep -q '^ii[[:blank:]]*linux-headers-vendor-rk35xx[[:blank:]:]' && packages+=('linux-headers-current-rockchip64')
dpkg-query -l | grep -q '^ii[[:blank:]]*linux-libc-dev-vendor-rk35xx[[:blank:]:]' && packages+=('linux-libc-dev-current-rockchip64')
G_AGI "${packages[@]}"
G_AGP linux-{image,dtb,headers,libc-dev}-vendor-rk35xx
[[ -d '/boot/dtb' ]] || sudo dpkg-reconfigure linux-image-current-rockchip64
/boot/dietpi/func/dietpi-set_hardware flash-u-boot-mmc
sudo sed --follow-symlinks -i 's/ttyFIQ0/ttyS2/' /boot/dietpiEnv.txt
if systemctl -q is-enabled serial-getty@ttyFIQ0
then
/boot/dietpi/func/dietpi-set_hardware serialconsole 0 ttyFIQ0
/boot/dietpi/func/dietpi-set_hardware serialconsole 1 ttyS2
fi