I went into the lab today with Vega. I went through the frame data and had some fun with finding his links.
The frame data suggests there are more possible links. However, the spacing on some of them do not allow the second attack to hit. For example, take the link for MP Claw, LK. I could not get the LK to connect because Vega was too far away after the MP Claw. I tried this against Ken only and no other characters. They may hit on other characters that have different hitboxes, but I did not test against other characters so I left them out of this list.
Claw on, Standing punch starter[list]
[] 57 = LP, C.LP - can cancel to special
[] 57 = LP, LK
[] 57 = LP, LP - can cancel to special
[] 48 = LP, C. LK
[] 87 = MP, LP - can cancel to special
[] 114 = MP, C.MP
[] 107 = HP, LP - can cancel to special
[] 107 = HP, LK
[] 107 = HP, C.LP - can cancel to special
[] 98 = HP, C.LK[/list]
Claw on, Crouching punch starter[list]
[] 57 = C.LP, LP - can cancel to special
[] 57 = C.LP, LK
[] 57 = C.LP, C.LP - can cancel to special
[] 48 = C.LP, C. LK
[*] 77 = C.MP, LK[/list]
Claw on, Standing kick starter[list]
[] 57 = LK, C.LP - can cancel to special
[] 87 = MK, C.LP - can cancel to special
[*] 117 = HK, C.LP - can cancel to special[/list]
Claw on, Crouching kick starter[list]
[] 47 = C.LK, LK
[] 47 = C.LK, C.LP - can cancel to special
[] 38 = C.LK, C.LK
[] 77 = C.MK, LP - can cancel to special
[] 77 = C.MK, LK
[] 77 = C.MK, C.LP - can cancel to special
[] 104 = C.MK, C.MP
[] 68 = C.MK, C.LK[/list]
Claw off, Standing punch starter[list]
[] 57 = LP, LP - can cancel to special
[] 57 = LP, LK
[] 57 = LP, C.LP - can cancel to special
[] 84 = LP, C.MP - can cancel to special
[] 48 = LP, C.LK
[] 87 = MP, LP - can cancel to special
[*] 117 = HP, C.LP - can cancel to special[/list]
Claw off, Crouching punch starter[list]
[] 57 = C.LP, LP - can cancel to special
[] 57 = C.LP, LK
[] 57 = C.LP, C.LP - can cancel to special
[] 48 = C.LP, C.LK
[] 87 = C.MP, LP - can cancel to special
[] 87 = C.MP, C.LP - can cancel to special[/list]
Claw off, Standing kick starter[list]
[] 57 = LK, LP - can cancel to special
[] 57 = LK, C.LP - can cancel to special
[] 57 = LK, LK
[] 48 = LK, C.LK
[] 87 = MK, LP - can cancel to special
[] 87 = MK, C.LP - can cancel to special
[] 87 = MK, LK
[] 78 = MK, C.LK
[] 117 = HK, LP - can cancel to special
[] 117 = HK, C.LP - can cancel to special
[] 117 = HK, LK
[] 108 = HK, C.LK[/list]
Claw off, Crouching kick starter[list]
[] 47 = C.LK, LP - can cancel to special
[] 47 = C.LK, LK
[] 47 = C.LK, C.LP - can cancel to special
[] 38 = C.LK, C.LK
[] 77 = C.MK, LP - can cancel to special
[] 104 = C.MK, MP - can cancel to special or target combo
[] 77 = C.MK, LK
[] 77 = C.MK, C.MP - can cancel to special
[] 104 = C.MK, C.MP - can cancel to special
[] 68 = C.MK, C.LK[/list]