1st, how does the boat balance while sailing, with the current rake? I suspect most folks with in-mast furling don't care about a well tuned rig, but if the helm is light or neutral now, raking forward could make things very unbalanced.
2nd, you seem to be using rake and prebend interchangeably. You *should* be able to remove lots of the prebend without changing the rake through adjusting the D's, mast step, and partners. Most swept-spreader rigs need some prebend, but you may be able to tune some out for the base setting, and allow the topmast backstay to be used for upper-range sail flattening. It would need to be eased during furling operations, naturally. For a new boat, the rig designer should have prebend numbers for you.
Significantly changing the prebend will likely require a trip to the sailmaker for a luff curve recut.
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