If you want to use openhdf outside of drones, it would be advisable to implement a gps rs232, a bosh bno055 AHRS i2c spi.
Because if it’s not a drone it would lose all telemetry functions.
gps GOOUUU-GPS+BD 9$, bno055 5$
I think the best and most easy is to use a cheap flightcontroller, even when not mounted to a drone.
They have all these sensors (except gps, can be added EZ) already onboard and software is ready to go and compatible with OHD.
For example an „omnibus f4 pro“ can be found for 15 - 20 €.