engram VS APT

No problem, see this discussion on the Engram forums for more ideas on Q and Z placement: there are non-magical solutions such as combos, hold-taps, etc. In particular, this layout has been applied successfully to an even smaller 26+6 keyboard, as a precedent.

I've considered both the earlier version of APT, as well as Engram, with these layouts putting punctuation on the center index columns.

See my Engram 2.0 review as well as my programmer-friendly adaptation for details.

On leaving QWERTY, you might also consider Arno's Engram 2.0 layout, which places all punctuation in the central columns so that your 8 touch typing fingers go straight up and down, effectively staying in their columns all the time. I've used Engram exclusively since the past 2 years (after 6 months of BEAKL-15, 16 years of Dvorak, and 6 years of QWERTY) and I've written about my experience with it here. Moreover, if you prefer standard shifted pairs (e.g. so quotes don't shift into parentheses), I've created a programmer-friendly variant called the "Engrammer" layout that helps maintain cross-proficiency with standard keyboards.

And if you prefer standard shifted pairs (e.g. so quotes don't shift into parentheses), I've created a programmer-friendly variant called the "Engrammer" layout that helps maintain cross-proficiency with the standard shifting model.

The discussion on Github is here: https://github.com/binarybottle/engram/issues/46

Specifically, the main distinction between this layout and Arno's Engram, is that this layout retains standard shifting (e.g. Shift-Quote produces DoubleQuote rather than OpenParenthesis) in order to lower the cognitive barrier when having to use standard or non-programmable keyboards. This discussion elaborates further:

One of the few that acknowledge this is engram: https://github.com/binarybottle/engram

I've already talked with the dev to try to create a spanish variant of Engram, but since this is a subreddit of some keyboard layouts nerds like me who have some skills in creating layouts, I ask YOU if you could help create the perfect spanish layout. It's not easy, maybe too complex right now and there needs to be some adjustment... but come on, we NEED a spanish layout! 500 million of potential native writers will thank you for that in the long therm.

I've considered both the earlier version of APT, as well as Engram, with these layouts putting punctuation on the center index columns.

APT

Apt: https://github.com/apsu/apt

It's a rather bad layout by current measures. Not a lot better than QWERTY, and barely better than std Norman, much worse than Workman, Dvorak, Halmak, Engram, Colemak, Semimak, ISRT, RSTDH, MTGAP, APT, Poqtea, Hands Down, and many, many others. Even the simple Notarise is much better (with similar distance stats), and is much easier to learn coming from QWERTY.

Or u/apsuity's Apt v3

I don't have any personal experience with anything except Colemak-DH so I can't offer recommendations based on personal experience. With that being said, if I was to try a new layout I'd likely choose APTv3 or some variation of Hands Down as I hear good things about both.

It's the L placement and left index _mostly. Right hand is a bit overloaded as well however, like rnv on ring and the f placement, never on dvorak despite being full alt is not fun lol. That is not to speak for all sfbs on right hand like rn, sl, ct and gh which are bearable to slide on a low profile keyboard but hard to deal with on anything else. It also creates annoying patters like ght and wr because it puts everything on this hand. Left index is all of that, squared. You can deal with it just like you can deal with qwerty's jank, but there's just many better options out there. You could for example take a look at apt

nah colemak is good, dvorak is pretty garbage. If you wanna try something with a similar feel that's really good maybe try APT. Instead of that you can maybe also try some colemak mods like Colemak DH or rollmak: q w f p b z l u o y c r s t g m n e a i ' x v d k j h ; , .