I have the same situation
Monitoring is not a problem, the HDMI output of BMPCC6K is only FullHD, any cheap monitor can do that.
I bought it cheaply in China and it has zoom and focus assistance for my old SONY camcorder.
But actually it's unnecessary, the BMPCC6K's own display is excellent and bright.
For control I will use the ATEM Mixer because I'm not a fan of Apple and don't trust an external Android program.
Everything also only works with Bluetooth, the BMPCC6K has no WLAN

So a distance of 10 is already critical.
With my SONY 90D I used WLAN and a router as a repeater, which was excellent

But we are with BMPCC6K and no WLAN.
The only question is the HDMI cable length?
For me it is 25m and 30m for two cameras. According to many opinions, this control is impossible without expensive converters to SDI.
I have now seen a solution (Youtube video that shows it works) which I will test.
so I ordered the ATEM.
It is expensive, over 1000 bucks because it has to be the extreme version, to control gain, focus, iso and shutter.
if it really works I'll be very happy.
There is another variant without BREATH

+Portkeys LH5H+
Connect with Bluetooth directly on the camera and then forward it to the LH5H’s WiFi
Unfortunately only FullHD
There are some other WiFi monitors if you want to trust them, but they are expensive because the principle is always:
First the route with Bluetooth from the BMPCC6K to the additional WLAN monitor and then from there via WLAN to a second WLAN monitor
What you save in the end is cable and laying it. The only risk is WiFi reliability.
What you also miss is ISO work, the ATEM saves your footage and takes it over for work with Davinci Resolve.
This is important for me when I work with 3 or 4 cameras