I don't think I've lost a miner when digging out a diagonal tile to tap into the holy liquid. Sometimes a low skill/clumsy dwarf will get a little melted if hitting a non diagonal stone.. but smoothing and carving a fortification works fine for those times

Although I've not tested it in 0.34, I believe that naked miners will be much more likely to survive than clothed miners. This is because burning clothes will kill a dwarf even if he escaped dying to the direct heat.

However for magma tapping, I've started just using a dwarf powered screw pump. Fills the magma plumping nice and quickly and to 7/7, while moving the magma up one z-level. Digging the inlet tile (if tapping the magma sea) is completely safe, and if the inlet is grated over nothing can come up through it (other than magma). Screw pump doesn't need to be made of magma-safe materials, I do it with silly stuff like silver corkscrews and lead pipes. Apparently wood doesn't work, if it did, I might consider it a bit too cheesy to use anyway. But in any case a stone block/metal pump never comes to any harm.

By Armoks bloody halls you figured it out thanks for sharing!

If all items were magma safe door, gate, lever, 2 mechanisms still only 5

Huh, that actually looks pretty nice. It's not as quick and easy as the old "Poke a hole" way but... it certainly seems it would work. And stop me having a miner, calmly walk out in the world and burn it down.

Huh... it makes sense. You've come up with a completely obvious solution that will be used forever by dwarves. You deserve a medal.

I found that if the "poke hole" is also a 1x wide channel with the slope wall that leads to a floor one zlevel up which is the preferred exit path, even a moron miner/mason will be able to escape unharmed.

This is how I got magma out of the volcano and into my magma glass furnaces safely.

Personally, as an addendum to this plan above, instead of diagonal mined tile next to the floodgate, turn it into a fortification. This will keep fire imps and magma crabs from pooping bassalt and flaming flatulence on your furnace operators.

Better idea:  Forget that, and instead build the impassable tile of your workshops over the channel to power them.  But *GASP* this means you have to plan ahead and build your workshops in an efficient pattern or you need a very large room - with magma under it all for them.