Your build is unrealistic for a true support. You'd need to KS quite a bit, which is generally frowned upon. ADCs without a doubt have the most damage potential late game, so while you may get an S, you're also stepping all over your ADC. If the other team has a fed carry, then you just shot your team in the foot big time. Sometimes you need to be the hyper aggressive one because you got a bum ADC, but I usually like to wait to see how they are.
You can build whatever you like on support, contrary to popular belief, but support income is always really low even when you're playing very good. I would adjust your build accordingly. You do need
, but honestly? It's just one of the best AP items currently anyways. There are mid laners who incorporate it into their builds. For someone as immobile as Heim, it does give you the ability to catch up to people as well on top of the gold income that you need.
You'd also have to be really careful with the turrets, and I'd imagine you'd make a random ADC you don't know very nervous. It isn't griefing if you build what you want or leave bot lane occasionally, however if you take an ADC's CS in lane without their permission than you will get reported. The reason anyone fears Heim is his turrets, and without them he is a bit weak. Early game if he doesn't have his turrets up, the enemy can usually get away with a lot. Even a melee support can bully you two out of lane or worse.
I could see both you and your ADC being very susceptible to an early all in, especially with an equally aggressive support that took ignite, which is why I believe you should take exhaust with an inherently passive champion as support. It does save you and your ADC because it momentarily slows them and causes them to do less damage.
All and all running these kinds of champions in a normals environment isn't bad and can be fun, but you would ultimately lose lane against an experienced support that knows how to play around the cheesy stuff. Basically you'd be very annoying for a little bit, but one faux pas and it could spiral out of control very quickly. Any AoE ability is going to really mess you up as well, and make your ADC very vulnerable.
As long as you understand all that, and don't take it into something like ranked, I think it is interesting to try this stuff out. People often don't realize their limitations until they have that one really miserable game though, unfortunately.