I would recommend avoiding bare pins for the ii/i2c/TWI. As this device isn’t mounted in a rack with the cables hidden behind, it would be way too easy to dislodge the cable when in use. This is why, after looking for options, I went ahead and adopted the Aleph’s 3.5mm “standard” with my remix beta unit.
Not so sure here either. Both Teletype and the Aleph have pull-ups, which we can augment with the busboards. I’ve been lamenting putting pull-ups on by beta unit as it seems to limit its use in those scenarios.