Anyone know of a way to get Inav into the Eachine f722 FC? Betaflight works but I want to do a bit of autonomous experiment

It's going to depend on whether INAV has a suitable target for the FC. Most Eachine branded FC's are clones but neither Eachine or Banggood currently list any Eachine branded FC's so it must be a discontinued product.

Can you please run the "dump", "diff all", and "status" commands in the Betaflight Configurator CLI tab and copy/paste the results back here. That will then help us to identify the FC.

my reasearch gave the first target specificly for eachine, maybe its just renamed; 

There are two EACHINE specific Betaflight targets available for F722 based FC's but there is nothing showing in the history that they were just copied from another already existing target, so without doing some extensive / time consuming comparisons with other target definitions it's not going to be easy to tell if the target from another known brand of FC might be compatible. If not then the OP is out of luck as there are ZERO targets listed under the INAV releases for any EACHINE specific FC's.