my advice – unless you have a lot of control and a lot of time (or a mattebox) – add the filters in post. You could tweak the WB to warm up the shot if you think you can improve on nature’s “golden” hour
Diffusion filters provide different amounts of diffusion at different focal lengths to match the diffusion in CU and WS you will need more than one filter
I would definitely play with the awesome array of image control functionality the XLH1 provides –