I uploaded my bin folder here:
sysupgrade loads and router seems to be working fine. It is a clone of @Ansuel repo with no added custom patches. Only added Luci OpenSSL collection + these 8 packages to the default config for anyone that wants to see how the latest NSS build (26 August 2020) works with their setup:
CONFIG_PACKAGE_kmod-nss-ifb=y
CONFIG_PACKAGE_kmod-qca-nss-drv=y
CONFIG_PACKAGE_kmod-qca-nss-gmac=y
CONFIG_PACKAGE_kmod-qca-nss-drv-qdisc=y
CONFIG_PACKAGE_kmod-qca-nss-ecm-standard=y
CONFIG_PACKAGE_iptables-mod-physdev=y
CONFIG_PACKAGE_kmod-ipt-physdev=y
CONFIG_PACKAGE_irqbalance=y