This was added in Mendix 6.9: https://docs.mendix.com/releasenotes/desktop-modeler/6.9#rendering-read-only-widgets-as-controls
You could go 'nasty'.
1) Find 2 images online for a checked and unchecked box and place them on.your page (in a table/div/page layout (not sure when the last 2 where introduced))
2a) Add a MF to the on click action of the images and in that MF do whatever you need to do. BUT change the show attribute to the correct value so it does represent the checked and unchecked state.
2b) Add the show attribute and use it to 'show' the correct image