You can extract reports using eclipse. The format is similar to xml, with open and close tags. I've recently written  a small python program to take a csv input with 4 columns (name of file | start string | end string | change to). Put the dashboards or reports you want in the same folder as the program and create folder 'out' in the same location. Run the program and it'll put all the reports, modified into that folder.

Not fool proof as it'll respond to the first iteration of string, but should be enough to get you started:

import getopt
import sys
import csv
import os

class Replacer:
    def __init__(self, bdir, fname, sfrom, sto, sval):
        self.bdir = bdir
        self.fname = fname
        self.sfrom = sfrom.replace('\n', '')
        self.sto = sto
        self.sval = sval
    def doit(self):
        infname = os.path.join(self.bdir, self.fname)
        outfname = os.path.join(self.bdir, 'out', self.fname)
        ifp = open(infname, 'rb')
        ofp = open(outfname, 'w')
        lines = ifp.readlines()
        cnt = 0
        longLine = ''
        for line in lines:
            longLine += line.replace('\n', '')
        if longLine.find(self.sfrom) >= 0 and longLine.find(self.sto) >= 0:
            sndx = longLine.find(self.sfrom) + len(self.sfrom)
            endx = sndx + longLine[sndx:].find(self.sto)
            oldval = longLine[sndx:endx]
            tmp = longLine[:sndx] + self.sval + longLine[endx:]
            longLine = tmp
            print "replaced <%s> to <%s>\n" % (oldval, self.sval)
            ++cnt
        ofp.write(longLine)
        ofp.close()
        ifp.close()
        
        return cnt
        
def main():
    def usage():
        print "usage: %s -c config_file_name\n" % sys.argv[0]
    try:
        opts, args = getopt.getopt(sys.argv[1:], "c:")
    except getopt.GetoptError, err:
        # print help information and exit:
        print str(err) # will print something like "option -a not recognized"
        usage()
        sys.exit(2)
    configFileName = ""
    for o, a in opts:
        if o in ("-c"):
            configFileName = a
        else:
            assert False, "unhandled option"
    print "configFileName: %s\n" % configFileName
    csvReader = csv.reader(open(configFileName), delimiter=',', quotechar='"')
    pathname = os.path.dirname(sys.argv[0])
    for row in csvReader:
        print "file: %s from: %s till: %s val: %s" % (row[0], row[1], row[2], row[3])
        replacer = Replacer(pathname, row[0], row[1], row[2], row[3])
        replacer.doit()

if __name__ == "__main__":
    main()