Oooh, that's quite nice!
It's for when I finally start to take him places, I know he'll be way over excited, so I don't want to faff with taking a headcollar off and putting a bridle on
Try performance equestrian (they have a website). They have all sorts of combination bridles and if you get the right one it can look quite bridle-like rather than a head collar with added bits! They also do matching martingales and breastplates if you need them. I have a brown biothane perfeq one with extra padding on the headpiece for exactly the same reason as you and it's quite smart (well for a combination - I'm not a huge fan but needs must!)