I love him so much <3 He's so... HNNG... I will do everything to have him in MMD QAQ I could help you with converting him, I was doing things like that before and PMD isn't that hard, there's a lot of tutorials ^^ of course, if you ever would want to and have time!
I know you can't use PMD editor, but it is possible for somebody to convert and remake him into an MMD model. There are also many MMD groups out there with professional users. Now for the picture: ASDDFGHGKJFGF SO PERFECT ADSFDSAG.