It might work. Those generic chain tools have presses that fit 5/8 chain sideplates properly so the process does not deform the sideplates or crush the o-rings. I tend to only use a chain tool to withdraw the pins from a rivet on the chain I am replacing (having ground the tops off) and to press the new link on (I wonder if your tool will do this). To peen the pins over on the new soft link I put a heavy hammer behind it and use a punch to peen 4 edges over, I then check with a caliper the peening has worked and the sideplate is secure.
I have a tool to push the sideplate on, i made this as the link supplied is a hollow ended & i am hoping that this will open (flange) the pins out, obviously i will check with a vernier caliper as to make sure its enough to make it safe! :eek
needs more duct tape
Treat everything in life the way a dog would- if you can't eat it or foc it, forget it.
I've run out of duct tape, was thinking of using blu tack but i'm not sure its strong enough :lol