Arming in loiter with rangefinders, no GPS

Hello,

I built an indoor drone with a range finder and optical flow sensor.

It flies and holds position (LOITER) decently however I have to arm in ALT HOLD then once it’s in the air I can switch to LOITER.

If I try to arm in loiter I get pre-arm check warnings:

PreArm: Need Position Estimate
Arm: Need Position Estimate

ARMING_CHECK = 0

I have a TFMini plus range finder which according to the documentation starts reading at about 10cm and I’m guessing that’s the reason it doesn’t know it’s position, is it possible to use a range finder that reads lower distances (1-2cm) only for take off then switch to the TFMini plus once it’s above 30CM for example? Meaning I will have 2 downward facing range finders, not to mix their signal just to switch between them

Is there a way to just disable that specific arm check? make it take off anyway? Because it will surely start reading data after take off (10cm)

Thanks a