It could definitely be an "option" to use J-8s as some form of UCAVs, but they won't be particularly efficient at their jobs and will probably just end up being high altitude, high speed targets or decoys. Certainly the electronics don't exist for it to effectively be used as a SEAD platform.
Better to retain J-8IIs in their current role -- interceptors. A few of the later blocks can carry a few PL-12 and PL-11s, and clearly PLAAF had modified a few to carry YJ-91/Kh-31 too. That doesn't mean J-8IIs are the PLAAF's primary SEAD or wild weasel plane. JH-7/A probably has that honour, along with Su-30s.