Firewire to USB-C adapter

What would it take to develop a modern interface to firewire 400 and 800 devices. The current best method appears to be a train of dongles, from usb-c to thunderbolt 2, then to firewire, then to the cable size you need. Could this be simpler? A box with an upstream usb-c port and the common firewire 400 and 800 ports.

Looking at the TI chips that power many pcie firewire cards, they expect to be attached to the pcie bus, or older chips expect the pci bus. There are thunderbolt to pcie external enclosures, so there is a way to make this work under thunderbolt, if only by using an enclosure and a pcie card. I should test that and see if it really works with modern computers.

Here is an external gpu dock https://www.amazon.com/External-Enclosure-Compatible-Thunderbolt-ORA-GDS-01/dp/B0D2V5YFMH/ref=pd_sim_hxwPM1_sspa_dk_detail_d_sccl_4_4/146-2569592-2382618?pd_rd_w=vVkaC&content-id=amzn1.sym.3a852a98-d65f-4301-9bd0-9b589b14d1ef&pf_rd_p=3a852a98-d65f-4301-9bd0-9b589b14d1ef&pf_rd_r=B6VCWFMCZP4Z2CD8JD8V&pd_rd_wg=Hx1bG&pd_rd_r=915bb3e8-49c4-4bec-82fc-55eac3bbd4fe&pd_rd_i=B0D2V5YFMH&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWxfdGhlbWF0aWM&th=1

The ADT-Link K43SG-U4 4.0 https://www.adt.link/product/R43SG-TB3.html is a thunderbolt 3 egpu dock PCIe4.0 x4 40GB/s speed device.

Another dock, the ORA-GDS-01 uses the Intel JHL7440 thunderbolt 3 controller, there is a newer version, the JHL9540, released Q3 2024, I will look into developing with it. The JLH9580 seems to be the Thunderbolt 5 version of the controller.

It seems like any of these chips would allow interfacing with a firewire chip. The pcb would need a thunderbolt 4 connector, the thunderbolt chip, the firewire chip and some firewire connectors, preferably 400 and 800 connectors. It seems like thunderbolt could supply power to the firewire devices, since thunderbolt is more capable than firewire.

I spent an afternoon researching which chips would work, reading datasheets, looking for similar projects, brainstorming how I could accomplish this and came up with the information above. Today I asked deepseek R1 how to do the same thing, in under a minute it gave me a long, detailed list of the exact same research, with the same chips and a circuit diagram and suggestions on how to bridge the protocols using an fpga. An even more complete first draft than I made in a few hours work. It's hard for me to think of asking an AI first, but I will make an effort going forward, it is an e-bicycle for the mind. I then asked for suggestions on how to write the fpga component, it wrote sample fpga code for firewire and thunderbolt interfaces.