help needed with project notation strategy

[Dave Phillips]

Greetings,

I wrote a piece for piano that I want to notate with LilyPond. The piece 
has some difficult aspects regarding which I need some advice or just 
confirmation that my strategy is sound (or not).

The piece is long, 848 measures of varying textures, styles, tempi, and 
time signatures, with a playing time of about 34 minutes. I plan to cut 
the file into manageable sections and hand-enter the notation in LP 
code. There are unplayable parts that I'll assign to a recorded part, 
though I also want to notate them.

I haven't had a lot of luck with midi2ly, though I'm sure I need to 
learn how to fine-tune its output. Odd groups (7:4, 5:3, 11:4, etc) 
occur frequently, and I'm not sure how to specify their correct 
conversion with midi2ly. Also, the original sequence has both hands on a 
single track. Is there any handy way to indicate a split point for 
switching staves, i.e. a way to recognize right and left hand passages ? 
(I think I might be asking for an impossibility, would love to learn 
otherwise).

I can hand-enter it to manuscript, no trouble, but I need a digital 
publication-ready score. I figure the work will take many months, hence 
my desire to find the most efficient working method, any useful advice 
will be hugely appreciated.

Btw, I'll likely use Frescobaldi as front-end for LP.

The piece is here is anyone wants to check it out, but please understand 
I'm not advertising my music on this list. This recording sucks anyway 
sound-wise, I hadn't purchased Pianoteq then. I also plan to re-record 
the piece with that software.

https://soundcloud.com/davephillips69/piano-zero

Thanks in advance for any advice and/or suggestions for an improved 
working method.

Best regards,

Dave Phillips