Nah. DB hammer (which is rubber). Works on everything
Trust me, it WOULD knacker most Irmscher wheels. I buckled one (MFL MV6 standard one) just with a massive understeer moment.
A rubber mallet would distort most of them.
If I caught any garage using a mallet on any of my alloy wheels (esp the Irmscher ones), I'd be using the mallet on their head.
What's different about these irmscher alloys in particular? By your description they sound completely unfit for the purpose of being an alloy wheel!
This isn't a "I know best" discussion. But I do this almost every day. Not one problem in the three years I've been there.
Like anything Irmscher make, I would agree, they are barely fit for purpose.
And, honestly, without any shadow of a doubt, using a mallet on either a MFL MV6 wheel (not that there are any about nowadays, they were
that bad) or an Irmscher Sportstar 18" would distort the rim. First hit.
Hence other methods needed for these (and, TBH, a lot of high end large alloys now) if the owner has been too lazy to maintain the car. Also, hence, if I caught a garage doing it to TBE or the pussy cat (don't give 2 stuffs about battlebus, and the alloys look robust on that), I would be doing the same to the technicians' face
