I have those two Helios 44 lenses. One for M39 (SLR) lens and the other for the Soviet Start SLR camera (left).
I tried to sell my Soviet Start NOS in box SLR camera + Helios 44 (bayonet mount) but was not able to sell it (even at a quite low price).
Then I searched for an adapter to use the Helios on a digital mirrorless body and found a person in Ukraine that printed such adapters (M39 (LTM)). Then it was easy to put on a M39 LTM to Z adapter.
The Helios for the Start camera has 13 aperture blades. I have not really used it yet but tried it tonight with the picture of the dog at f/2. I can see I hit sharpness at its nose.