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You can lower both ends the same amount & thus keep the geometry the same. Just make sure that nothing touches at full compression & that ground clearance for cornering will be reduced, thus restricting maximum cornering angle & speeds.
You can work out the maximum you can drop the yokes by getting some helpers, then measure the fork protrusion above the top yoke, now loosen the top yoke & remove the fork caps. The forks will collapse to maximum compression position. You need helpers to stop the bike falling over. The fender & wheel should NOT touch the radiator or fairing. Check how much clearance you have. Then loosen the lower yoke slowly & stop before the wheel/fender hits the rad. Tighten up the lower yoke & you now have the absolute minimum you can set it to. Now get helpers to lift bike so the forks extend & allow you to fit the fork caps. Tighten the top yoke. Note the fork caps do NOT need to be tight, just turn them until they stop on the fork top. The yoke clamping force means they will not undo. Just thought pregen might have internal caps retained by circlip.
Check the height of the fork above the top yoke now. DO NOT ride the bike like this, it may be unstable. You now need to lower the rear by the vertical drop at the front, this is not the same as fork protrusion ! Use longer or adjustable dog-bones to do this.
YMMV
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