I see you are soon to be selling a weldless thermowell and are recommending it for use on your Kegmenters.
https://www.kegland.com.au/3-8-inch-bsp-thread-weldless-thermowell.html
Will one of these still allow pressure fermentation (at around 12-15 PSI) and if so will the 36 PSI PRV on your pressure fermentation lids still be suitable?
Yes this will do the job nicely and will be fine under pressure. Make sure to drill a clean hole and file it down smooth so you get a good seal.
We have some digital temp guages that will work well with this product but they are not in stock for at least a few months wile the injection moulds get finished.