Google coral pcie to usb adapter

Dear all,
I’m ready to buy a coral tpu mini PCIe adapter to speed up frigate addon on my home assistant virtual machine.
In the future, I’m thinking about switching to a dedicated Raspberry PI 4 or 5… Do you know if exists some sort of adapter from mini PCIe to USB 3 ? Or it’s better to buy directly the coral USB version?
Thanks

Direct is best

I had PCIE to USB3 and sometimes loss connection after server reboot

Direct is also faster and now has dual TPU version available…not that it’s needed