IT MAY BE DIFFICULT! BUT THESE WILL FUNCTION WITH A SINGLE COIL ALIEN IF YOU ARE SAVVY!!! (A good Option for an RTA whilst there are none) 

https://misterdevices.com.au/products/alien-invasion-alien-1

Geekvape Zeus X Mesh RTA Mesh Version, made of stainless steel, is an upgraded version of the original Zeus X. Geekvape Zeus X Mesh RTA features the innovative top-to-side airflow system and leak-proof top airflow system to maintain great flavor. Zeus X Mesh RTA comes with bubble glass, straight tube and modular build deck to build mesh coil easily.

Features:
Stainless steel construction
The innovative top to side airflow system
Leak-proof top airflow system
Modular build deck, mesh coil for purer flavor
Bubble Glass and straight tube included
Compatible with 810/510 drip tips

Specs:
Material: Stainless steel & Glass
Size: 25* 47.8mm
Capacity: 4.5ml/3.5ml
Drip tip: 810 drip tip
Thread: 510
Package: Gift Box

Package includes:
1pc Zeus X Mesh RTA
1pc N80 mesh 0.17ohm coil
1pc KA1 mesh 0.2ohm coil
1pc Spare glass tube
1pc Spare drip tip
1pc Accessory bag