Just a consideration when using light braid main line to a heavy braid casting leader to heavy mono:
When you snag, and you will, something needs to give.
I like a fuse somewhere up front such that I don't break my main line off 50m up....
Aside from cost and inconvenience, there is the harm 50m of braid flapping around a beach can cause
As an example:
25lb main line FG'd/stitched to 50lb braid leader; FG'd to 1m of .70mm mono - if you snag you run a high risk of breaking off your mainline as .70mm mono breaks somewhere around 50lb... (unknotted of course) assume 10% loss when knotted and wet it should break at say 45lb; way more than your main line.
25lb main line FG'd/stitched to 50lb braid leader; FG'd to 1m of .50mm mono - if you snag the wet knotted mono should break first...
Something you need to think about and test when you decide on your mono dia / breaking strain