Check out the krun runtime for podman, if you want stronger container isolation from the host. It creates a small VM for each container. Gpu passthrough on linux is limited though.

Sorry for not answering to your question directly, but why not just use subuids for separation instead?

podman run -d --restart unless-stopped \
  --uidmap "+0:@100001:1" \
  --name nginx-1 \
  --port 8081:80 \
  docker.io/library/nginx

podman run -d --restart unless-stopped \
  --uidmap "+0:@100002:1" \
  --name nginx-2 \
  --port 8082:80 \
  docker.io/library/nginx

From their site:

Taler does not introduce a new currency. Taler uses a digital wallet storing coins and payment service providers with settlement accounts in existing currencies. Thus, Taler’s cryptographic coins correspond to existing currencies, such as US Dollars, Euros or even Bitcoins.

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