annoying breaks in the gnus registry file

["Ted Zlatanov" <tzz@lifelogs.com>]

Occasionally I'll save this to the Gnus registry file, which breaks it:

("<200505101018.j4AAIDsw021967@relay9.bu.edu>" ((mtime 17024 47890 802976) (process (spam spam-use-move "nnimap+lifelogs.com:INBOX.spam")) (sender . "<preprogrammed@ctlnet.com>") (subject . #
("Нет \xc3\x90\xc2\xb2ысшего обр\xc3\x90\xc2\xb0зовани\xc3\x91 =?utf-8?q?=8F? =D0=9C=D1=8B =D0?= \xc2\xbfоможем Вам" 0 4 nil 4 6 (display "\\320" help-echo utf-8-help-echo untranslated-utf-8 208) 6 8 (display "\\262" help-echo utf-8-help-echo untranslated-utf-8 178) 8 11 nil 11 15 nil 15 18 nil 18 20 (display "\\320" help-echo utf-8-help-echo untranslated-utf-8 208) 20 22 (display "\\260" help-echo utf-8-help-echo untranslated-utf-8 176) 22 25 nil 25 28 nil 28 30 (display "\\321" help-echo utf-8-help-echo untranslated-utf-8 209) 30 65 nil 65 67 (display "\\277" help-echo utf-8-help-echo untranslated-utf-8 191) 67 70 nil 70 74 nil 74 77 nil))))

The question is, how can I transform the text above into something
that gnus-gnus-to-quick-newsrc-format can save reliably?  I use that
function thus:

(gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist)

so I don't have to write my own, but it breaks often with such spam
subjects, and then Gnus won't start.  So I want to transform the text
before I hand it over to that function.

Ted