See above edit
Dynamic Environment would be fine to add on the end, but remove
U-Boat Watch Crew Routine SFX first as it may get overwritten depending on which bits of Dynamic Env you choose to install. Just add it back in after DE and it'll work fine.
I have DE in my mods list (in sig) if you want recommendations on which aspects of DE to use (note, I don't use sounds as I have Stormy's DBSM, but they are good if you don't use DBSM). If you want to list the mods you plan to try then go ahead, I'll have a look - or you can follow the install order in my list with the mods you want (leaving out any you don't, just keep the same order) and you should be fine.