There are websites that let you rent GPUs for cheap, such as QuickPod. Have you checked those P2P GPU rentals out?
The hard part was that the original Orthrus works with transformers, but 3.5(and 3.6) is Hybrid: 75% GatedDeltaNet + 25% GatedAttention. I am testing a trick that might make is work with the GatedDeltaNet, and dry runs are promising, but only a full train will reveal if it works. More information in the repo and on the site under the "What is this all about?" button.
Note: i may restart it or try different configs at different points, if the site is down there is probably some sort of result/conclusion in the repo.
As for the treating them as a block idea, that was my initial plan, but the GatedDeltaNet is doing most of the work in 3.5. Trying to bundle them together would hurt acceptance rates drastically, potentially making the speed benefits not a lot bigger, or smaller, than the native MTP.