Helping hand based on flexible coolant pipe, alligator clips and a floor tile. Model is created for 1cm thick floor tile. Fusion Model is parametric so you can change the "PlateGap" Parameter in Fusion 360. It can be difficult to screw the pipe in, but it's possible.

Pros:
-small print volume
-low parts cost (Total cost ~6€)
-heat resistant base plate

flexible coolant pipe: https://www.aliexpress.com/item/6pcs-New-Light-Oil-Coolant-Pipes-300mm-1-4-Round-Nozzle-Water-Cooling-Flexible-Oil-Coolant/32812996584.html?spm=a2g0s.9042311.0.0.42984c4dZNNKtA

alligator clips: https://www.aliexpress.com/item/10pcs-lot-Insulated-Crocodile-Clips-Plastic-Handle-Cable-Lead-Testing-Metal-Alligator-Clips-Clamps-52mm-Length/32759837600.html?spm=a2g0s.9042311.0.0.42984c4dZNNKtA

silicon tube to cover alligator clips: https://www.aliexpress.com/item/1-Meter-Food-Grade-Transparent-Silicone-Rubber-Hose-4-5-6-7-8-10-12-14/32858462618.html?spm=a2g0s.9042311.0.0.42984c4dZNNKtA