Change Gravity for 1 map?

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We have a map in our instagib rotation (q3mbd). Great map for insta, but it's built to be low gravity. Is there a way to set g_gravity "800" for 1 particular map in the rotation if map is natively low gravity?

PS. Anybody who wants to fix the grapple for instagibplus 1.27, please do!

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Solved on another forum, here's the solution:

set d20 "map hb3 ; set nextmap vstr d21"
set d21 "map q3mbd ; g_gravity 800 ; set nextmap vstr d22"
set d22 "map q3exdm3 ; set nextmap vstr d23"

I had the gravity settings before the map, which was obviously dumb after the fact.