The staysail boom is the easiest way (least amount of hardware) to make the sail self-tacking.
If you want that feature, but not the boom, you need an Elvstrom-style traveller track for the staysail - arguably just as much in the way depending on just where it would have to live to be effective.
If the rig geometry is such that the inner forestay can be removed, as jrd suggests, then perhaps that is something to investigate and you'll have the added advantage of not having to tack the genoa around the inner stay all the time. But it will also require rethinking the sheeting arrangements for the staysail.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)