Checked this topic?
https://www.core4d.com/ipb/forums/topic/117430-boat-wake-in-c4d/#comment-752951
Maybe there are still valid plugins available.
Do you really need to use bitmap at all? I presume this is because you need to have correct wake shape (kelvin wake). In such case bitmap will just be showing static deformation. Maybe you are better off with something animated, yet not physically correct (do a search in file pits, there is boat wake with fields).
If you need correct, simulated kelvin wakes you are looking into custom solution, doable by nodes or python. This is quite a task since you need to include bow an stern wakes, take boat size into account, time and decay, that is a lot of math...