Bill.... et al, You are right Matt Mathews has done quite a bit a research on Blunt. As far as short bio's on Blunt, there are several. I believe that the KSHS 1932 volume that contains the memoir of Blunt also has a short bio. Michael Banasik also provided a short bio in his book on the Prairie Grove campaign. There are other short ones that I have not reviewed lately.
Some of the problems with these short biographies are:
1.) They are colored by time and proclivity, southern or northern.
2.) There are strong opinions on Blunt's honesty and soldierly qualities.
3.) There are assumptions made on Blunt's health, specifically his death in an "insane asylum". His attending physician contended that he suffered from heat stroke during the 1863 campaign in Arkansas near Fort Smith.
Given these issues you will probably strongly lean towards modifying any biography you might find useful.
Please let me know if I can be of assistance.
PS due to spam I have temporarily blocked out my e-mail so if you post a reply I do check this board with some regularity.