The groups you are considering are a special class of Shephard groups, which are obtained from Artin groups by adding relators $\sigma_i^{k_i}=1$, $0\le k_i<\infty$ for every Artin generator. Biautomaticity of some of all these groups is conjectured in http://arxiv.org/abs/0901.0094 and this conjecture is verified in some cases. TheseUnfortunately for you, the results apply to "most" but not all groupsin this paper require that the Artin graph contains no triangles with label 2, which will exclude quotients of classical braid groups. Nevertheless, you are interestedmay want to read the paper to see if the methods could be useful in the context of your question.