I'd also be concerned about anything heavy and unsecured on the boat, especially lead ingots. They could easily snap off a seacock if your boat started getting tossed around.
A polyurethane foam would probably work, but I'd make sure it is impermeable to oil and water so it doesn't turn into a mess.
Other than keel ballast, my boat has a closed chamber in the bow filled with powdered lead. There is a removable inspection cover to access it if it ever needs checking or adjusting. I haven't seen this method used on any other boat but it makes a lot of sense to me. Nothing hard to get thrown around but still easily movable. It also gives me a watertight bulkhead at the bow from the waterline down.
Any chance of doing something similar? - sealing off the area and grinding up your lead with a meat grinder?
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