Sure, hexbalde is perfectly viable alternative. Though it rather awkward patch for non-functional blade pact. Ideally you wouldn't have hexblade, but an option to build a viable melee lock of any flavour (patron.) And you should also be able to be build a viable caster-lock that doesn't have eldritch blast. It is just weird that all warlocks from completely different patrons would have it, players should be able to choose attack cantrips that fit their theme better without being mechanically penalised for doing so.Pact of the Blade Hexblade Warlock is my go-to 5e Gishy.