Alan ... from MFI!
Hmm ... a Tourist Visa. Normally, I'd be inclined to dissuade anyone from applying for one, based on its [well-*documented - excuse the *pun!] lower success rate, overall. However, in YOUR particular circumstances, it might be worth the risk - given your girlfriend's unblemished record as an OFW in Japan and Thailand. Moreover, I believe it's also possible an ECO would take into account the obvious difficulties faced by someone still in the throes of divorce **proceedings ... where **these could-well overlap the timespan allotted for a couple to marry under the terms and conditions of a fiancee visa.