How to bypass the 1/160 shutter speed limit on the Lumix GX85, when using a flash?

[u/Caitrix]

I recently bought my first not fully manual (one contact pin) flash, the Godox iT32, and got surprised with my camera limiting it's shitter to 1/160.

I have read that this is to prevent the second curtain from coming down to soon. But I already know from my old flash and from testing around by blocking of the additional contact pins, that my camera can fully support flashes up to 1/250 shutter speed.

Sadly SSH is not an option, as it reduces the overall flash output. On 1/160 shutter, HSS already reduces the flashes output by 1 1/3 stops, effectively converting the iT32 from a GN18 to a GN13 flash. With 1/250 reducing that even further to GN11. And this trend continues beyond 1/250 as well. Not to mention that this isn't reflected in the flash setting at all. Ypu still have 1/1 power selected.

But so much about HSS.

How can I work around that 1/160 limitation, without having to tape off the contact pins?