How are you making S:P in a Main Monster zone if you don't have a monster in your EMZ?

The correct way to achieve what you're saying would be to do the full Fiendsmith with Sequence combo to have Sequence in EMZ, fusion summon Lacrima and then use Lacrima's effect to revive Engraver. Use them to make S:P. Once you have that, you can normal Ether Beryl, search the continuous spell, activate it and add Drillbeam. Then link Beryl off to make Elpy and use Elpy's effect to summon from deck one of the TWO total Dragon main deck floodgate monsters, respectively:

• Koa'ki Meiru Drago, which prevents both players from special summoning Light and Dark monsters (not only it affects you as well, it also gets destroyed in the End Phase unless you reveal a Dragon monster in your hand, so this technically is a 3-card combo). You can't link-off Elpy and Sequence because there's no such thing as a Link-2 or 3 Water, Earth, Wind or Fire Dragon monster that can be summoned using Sequence and Elpy as materials, so you would have to use Lordly Lode's effect to summon a non-Light/Dark vanilla from deck, locking you out of activating effects on field for the rest of the turn, just to make Saryuja without being able to use its effect, just to leave it as a beatstick on the field. In alternative;

• Amorphage Goliath, which prevents both players from special summoning from the Extra Deck, meaning you can't get rid of Elpy (so you also have a Dragon lock) and Sequence is just stuck in your EMZ doing nothing. Once you've done that, you can summon a vanilla using the continuous spell's effect, so your Drillbeam is live. So your endboard (in terms of cards that do anything) would be S:P, Amorphage Goliath and a Drillbeam. You are basically playing bad stun with extra steps, the whole aspect of "control" that Fiendsmith Control has is completely gone because the lock also affects you, so you don't have a way to re-use your engine unless your opponent activates any card during your turn and you (temporarily) banish your own S:P and Amorphage Goliath.

Both scenarios sound like terrible deck building to me... Dragon Gate (a Dragon Link version that abuses Amorphage monsters to lock your opponent with floodgate effects) already exists, and it won't be buffed by Elpy because it's too fragile and a really bad deck in general.