I believe, replacing S5553 with e3c224d2l is not a good idea. unless you upgrade to newer mini-itx boardTyan S5533GM2NR-LE, also Mini-ITX
https://www.tyan.com/Motherboards_S5533_S5533GM2NR-LE
It runs Proxmox hypervisor -- with opnSense and an Ubuntu container (XRDP, Apache Guacamole, qBittorrent)