There are no lens options for the NP-5 or any of the JVC projectors. The max screen size you can go is ~108x61 or a 124" diagonal in 16:9. For 2.35 material you have to watch with black bars on top and bottom.

There is another solution but of course it costs more. If you add an anamorphic lens you would keep the same 61" height for the screen but you could use a 2.35/2.4 screen ~143x61 or 155 diagonal. You can often find good lenses on ebay for under $1500 where they would be $6000+ new.

Here is one
[Link: ebay.com]