[dfw]

I used these on my eachine, but I did not replace the FC:
https://hobbyking.com/en_us/12a-esc-combo.html
The standard Eachine FC will support one-shot, (already a big improvement) but it won't support Dshot. I would suggest replace the ESC's first, upgrade your existing FC to the latest Betaflight to support oneshot and see how that goes. Let me know if you need help reprogramming your FC.

If you want to go all-out, then I think you are getting a cleaner build to build from scratch, rather than upgrading on the eachine 250 frame.