Hi,
sorry there is not a script that do something like this. But you can manage this with SQL queries.
REMOVE ALL PRIVACY VALUES
If you need to reset all privacy values (so all user inherit default value) then you can delete all values from privacy column in the table #__jsn_users with a query like this:
UPDATE #__jsn_users SET privacy = '';
CHANGE PRIVACY VALUES
Privacy of each field is store with JSON format in the column called "privacy" (table #__jsn_users), so you can use these queries
for each field:
UPDATE #__jsn_users SET privacy = REPLACE(privacy, '"privacy_fieldalias":"0"', '"privacy_fieldalias":"1"') WHERE INSTR(privacy, 'privacy_fieldalias') > 0;
UPDATE #__jsn_users SET privacy = REPLACE(privacy, '"privacy_fieldalias":"99"', '"privacy_fieldalias":"1"') WHERE INSTR(privacy, 'privacy_fieldalias') > 0;
The first query change privacy from Public to Site Members, the second from Private to Site Members
NOTE: we recommend you to make a backup of your DB before do this