Not that I know of, the DIY method is to use the jubilee cup.
https://www.evanscycles.com/brompton-firm-suspension-block-EV142304?esvt=1506-GOUKE323572&esvq=&esvadt=999999-0-35258-1&esvcrea=61231696736&esvplace=&esvd=m&esvo=EV142304-NA-NA&esvaid=50080&gclid=Cj0KEQjwqfvABRC6gJ3T_4mwspoBEiQAyoQPkZfd2BLxiRlxcoWeRgtp3X9NJ4YVnwHCt3Lgbvf5fsYaAgr78P8HAQ
Non?
He said he already have the firm block.
@Sam started
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Not that I know of, the DIY method is to use the jubilee cup.