Look at the SJCAM 4000 \ 5000 - a go pro copy and quarter of the cost. they are so good, there are fake ones on the market, so ensure you get from a good seller from Amazon.
https://www.amazon.co.uk/SJCAM-Multi-function-Waterproof-Camcorder-wide-angle/dp/B01HXQ70K6
plus, outside the case, they fit the generic go-pro mounts.
havign a screen and wifi streaming is good too - mine hasnt missed a beat.
R