The UD Bellus is dual coil and comes with an adaptor for single coil, and can be tightened down for m2l. So can their Goblin Mini, but there's no anytime deck access on that.
The new Wismec Theorem would also be worth a look.
Take a look at my new design with Augvape, Merlin. There's a thread here with info and pics.
Unfortunately, there's not a huge amount of budget authentics for m2l now that I think about it. The new Griffin25 and the Avocado come with a single coil adaptor, but I'm not sure how well either works when reducing airflow. I haven't tried it on the Griffin, and don't yet have an Avocado.
Another worth a look for you is the Fodi from HCigar. And their HC Plus if you can still find it. I got mine from Froginfog in China.
These may also be worth a look, but are older now, and maybe harder to find:
Focusecig Focloud
Lemo, though no anytime access to deck
UD Aga t5