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No, but...
A few years ago I had a Classic that I fitted a diy PID to, only on the boiler thermostat, so the steam wiring was untouched (sans PID).
I learnt a lot about the existing steam thermostat and how it operates as the PID would read out the boiler temp.
When the steam switch was turned on, the temp would go to around 145-150 degrees, then the light would come on to indicate steam was ready. As soon as the steaming started, the temperature would plummet down to around 110 degrees and fizzle out. It would then take forever for the thermostat to kick in again and get steaming.
So I learnt to start steaming around 140 degees ish, whilst the light was off and boiler still getting up to it's 145/150 degrees cut off. This meant that the thermostat would stay on and the steam would be continuous.
The Gaggia stock thermostats have massive swings and a long time to kick back in again, but a bit of trial and error works a treat! You may even be able to get a cheap digital thermometer that you can attach to the boiler somehow from the inside and get to know a bit more before splashing out on any other upgrades.
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Kalkhoff
Whilst we are on the subject of steaming, have any Classic owners installed this Shades Supersteam mod? Is it any good?
Currently when steaming the pressure drops half way through and I need to stop and wait till it gets up to temp again. This mod sounds like it fixes that issue?
https://www.shadesofcoffee.co.uk/post-2018/shades-supersteam-kit---classic-pro-evo---steam-power-upgrade