Note that I would personally like to see the management software built for aarch64. I just don't think it's going to happen.
I ended up getting a small amd64 VM host to run my management VMs for API development. Super Micro A2SDi-8C-HLN4F (Intel Atom C3758; 8c8t, 25W TDP), 128 GB of RAM, a 500 GB NVMe SSD, four 1 TB SATA SSDs, and Akasa Euler M case (fanless). It's a slightly boosted Antsle one D+ (2x default RAM, 2x default SATA SSDs). Mine is running Windows Server 2019 Datacenter with Storage Spaces and Hyper-V. I use the R81.20 CloudGuard image plus some scripts and a few OpenBSD VMs to build a rotating SmartCenter and a separate rotating MDS, both with eval licenses.