Thanks
GF, that is very kind of you to suggest that alternate path, it is a great suggestion. It's actually 100 nm shorter than the original (coastal) route that I proposed above.
I have a still-air range of 1,300 NM after allowing for 'ample' reserves, and would feel very comfortable planning UHMM to UHWW as a single leg, particularly if I route so that I pass overhead UHHH and can then do 'planning based on reclearance' when I pass overhead UHHH.
For the benefit of other forum members who may refer to this thread in the future for planning similar flights, I've posted an illustration of the inland route that you proposed.
Alternative Inland Route