Edit: sorry I just re-read your post. By pedal brake do you mean coaster brake? If so, no – you can’t use a spring loaded chain tensioner (including a derailleur).
~~Derailleur as a chain tensioner can work, but how are you holding it in place here? Is that zip tie holding it? I wouldn’t trust that long term.~~
~~If your lower limit screw has enough adjustment that it can hold the derailleur in line with the chain then you’re all set. If not you can install a short cable between the barrel adjuster and the fixing bolt. If you do it right you can use the barrel adjuster to fine tune the derailleur position.~~
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Edit: sorry I just re-read your post. By pedal brake do you mean coaster brake? If so, no – you can’t use a spring loaded chain tensioner (including a derailleur).
~~Derailleur as a chain tensioner can work, but how are you holding it in place here? Is that zip tie holding it? I wouldn’t trust that long term.~~
~~If your lower limit screw has enough adjustment that it can hold the derailleur in line with the chain then you’re all set. If not you can install a short cable between the barrel adjuster and the fixing bolt. If you do it right you can use the barrel adjuster to fine tune the derailleur position.~~
https://preview.redd.it/00257v6iwzyc1.jpeg?width=850&format=pjpg&auto=webp&s=9a3cf53c2b63a5d32f4e7ae9a8ac1631cab93b17
I’ve seen some videos of people removing coaster brake functionality from shimano IGHs.
Not with anything spring loaded, I’m afraid. You need a fixed position chain tensioner, [like this](https://www.stkildacycles.com.au/superb-chain-tensioner-bike-tool.html)