Yes exactly

Raw block storage is on the HDD, they are sequential and don't need the benefit of the SSDs random I/O writing speed. The chainstate/ utxo set are on the SSD and this is where the speed is needed for validation.

No pruning needed. You can store on HDD and SSD < 1TB will handle everything else. Can even fit electrum server on the SSD as well in this scenario.

Even a 1TB SSD and a 1 TB HDD will allow you to work with what you have for longer and then by the time we need to get new hardware the hardware situation should look different.

I use proxmox and an ubuntu VM to achieve this. Claude helped a lot in working through the pain points.

It's possible to separate a full archival node between your existing SSD (not 2tb) and a HDD (probably have one lying around). No real performance loss that I've noticed once ibd is complete which you already have.

Depends on your setup how easy this would be.

This completely misses the point. Its about capturing the energy as we move more towards a world which uses AI as a widespread tool.