I'm not sure if you made your decision already but I also sail in sometimes shallow (tidal) waters. If you really have a minimum of 48 inches everywhere - you'll be fine with full draft. But if you don't, there's another solution - I have an extra quick pin hole on my front foil mast at 36" from the base. This results in a displacement mode draft of ~30". (Rear mast can be set at similar height). It is still possible to full foil in this mode though "touch and gos" happen more often - they are way less dramatic than if you come down from full height.
You could make the same modification with a hand drill and some careful measurement. Drill press even better.
Looking again at the full foil length - 48" probably does touch bottom so you'd want an area with probably 50" everywhere to use the full foils. But obviously with the mid-height mast hole you'll have some clearance.