Yes, I use Amethyst and relay.tools client.
#amethyst allows you to post to specific relays, i did all the Olympics coverage eith nostr:nprofile1qqsqgq7gdgdmfnauxny2fylm68cdzkx59hgx6ql25deq3q4qvmf6x7qpremhxue69uhk7mred4cxjcmnxgcrydpwdehhxtnnda3kjctv9uq32amnwvaz7tmjv4kxz7fwv3sk6atn9e5k7tcppemhxue69uhkummn9ekx7mp0vf3fqg in a private relay
Discussion
There's one page for every relay he hosts and you can set that same up for any self-hosted relays that uses his FOSS app.