Sure. For a frigate, it is better to combine with CIWS, or use radar seeker guided missile. So is Umkhonto-like Sam useful? sure! But is it effective? No, at at least compared to common used radar seeker guided one.
I have done an estimation for ferry range of FC-31:
Mig29 ferry range is 1430 km and internal fuel is 4365 L, so the ratio is 0.328
Mig29M ferry range is 2000 km and internal fuel is 6250 L, so the ratio is 0.32
Correspondingly, JF-17 internal fuel is 2938 L, so its ferry range is 0.32*2938*2 =...
It is officially confirmed now
http://mp.weixin.qq.com/s?__biz=MzA3NjgzODgxNA==&mid=2651356857&idx=1&sn=fea7161de62383691c725f6c7fd6f940&scene=4#wechat_redirect
What I mean is: from the missile we can simply argue that FK-3 is not KS-1 because the aerodynamic feature is different.
These two having some similarity is because both of them are developed by the 10th Institute of CASIC