I bought it for the alpha6400 and am completely satisfied with it as a travel flash.

However, I assume that this should be possible. If not, you should be able to return the item if necessary.

If you have purchased an appliance from us, you can register a warranty claim within the warranty period via your customer account. https://www.digitec.ch/de/returnsandwarranty

Is the question still relevant?

For that, it would need this version here: Nissin i40 (clip-on flash)

This variant is probably not. But there is still the Nissin i40 for Panasonic. That could fit...

According to the manual, this clip-on flash is only compatible with certain Sony models.

Yes, according to the manufacturer, this flash should work with your Sony device.