Hello @MartinHerren,
It is possible to do it as you mentioned. However, in my tests, (once) the payload started to unpack, and the partition did not have enough space to continue, so the update failed.
So using the UDA partition (big enough) was a fail-proof option for my tests. But in the end, it will depend on how big your partitions are configured and how big your payload is.
As a side note, I faced this issue on an early release version of Jetpack, and I don’t know if that was fixed, but I can tell that the version I shared works as expected at least.
My recommendation is to test it as you described and if it works for you, it should be ok.
Luis