Good to check. As an example of complexities, many boats shift to becoming "cutters" with the addition of a staysail stay and find that the pull necessitates running backstays to counter the load. Others don't.
And the reverse happens. Bob Perry, who so repopularized the double headsail rig thirty years ago or so, once remarked on the amazing number of clients who asked him about just removing the forestaysail and its stay.
Both my schooners had a forestaysail tacked to the stem inside the jib, which was on a bowsprit. I found having the forestaysail up with the overlapping (as in 120% of J) jib was less efficient than have the forestaysail down. I also found that in all but the lightest winds going to weather was more efficient with forestaysail and smaller jib that just barely overlapped the staysail, not back past the foremast. That may have been partly because for both my schooners the big jibs were far from new but there you have it.
If you do go for a forestaysail, consider foredeck safety as you plan for any club or boom. Personally I'm a fan of the camber spar here but not all would agree and even that is not without some hazard.
There's a great deal of interlocking factors to be considered in even small rig changes.
G'luck
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