Making a clamping style adapter wouldn't be too hard. Another option is putting a holder behind the lens, i.e. inside the bellows...there use to be a manufactured one....the Xenophan filter holder.
More options, use a slower light sensitive medium, either a slower film or a alternate process. You can also use a film developer that lowers your exposure index. Wait until it get's darker. Shade your subject...
The first step is to do what someone suggest above, and take some meter readings in representative lighting conditions, and figure out how much slower an exposure would be ideal.
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