Judging by the current results of the OP poll, a new Monk build from the ground up would look something like:
Any poll option that enjoys a popularity of 63% or more should probably be part of the base class.
BASE CLASS = DECISIVELY POPULAR (63%+)
Unarmored defense (86.7%)
Martial arts / martial artist (83.3% / 80.0%)
Improved speed (83.3%)
Improved mobility, jump, run up walls over water, etc. (76.7%)
Ki, non-magic (76.7%)
Ki, supernatural magic (73.3%)
Skirmisher (66.7%)
Monk weapons usable with martial arts (66.7%)
SUBCLASS ARCHETYPES = POPULAR (40%+)
Disabler, imposing conditions (60%)
Improved Saves (53.3%)
Stances (43.3%)
Martial Maneuvers (43.3%)
DPS, high damage dealing (40.0%)
Resistances and immunities (40.0%)
Spiritual Monk / Priest (40.0%)
NON-DEFAULT OPTIONS = PROMINENT MINORITY (25%+)
Stealth (36.7%)
Brawler / Boxer (33.3%)
Armor (26.7%)
NOTE POLL OPTIONS WITH LESS SUPPORT (LESS THAN 25%)
Tank / defense (23.3%)
Non-Monk martial weapons (16.7%)
Straight-up magic (16.7%)
Other, please comment / something else (10% / 6.7%)
Based on this information the BASE CLASS can feature: unarmored defense, speed, extraordinary mobility stunts, extraordinary ki features, hit-and-run skirmishing, and an assortment of weapons suitable for martial arts.
Note, there is a similar amount of support for nonmagical ki (76.7%) and quasi-magical ki (73.3%). Probably the base class has ki as a mechanic, but the subclass archetype might use ki in other nonmagical ways or magical ways. I view the quasi-magic as definitely "magic" but a natural kind of magic that is definitely not "spells".
Regarding the subclasses. Stances and-or maneuvers can be a mechanic for a certain subclass. Imposing conditions or specializing in dealing high damage, are probably different subclasses. A super-tough subclass can feature heightened defenses including saves, resistances, and immunities. At least one subclass archetype has the flavor of a spiritual path.
The non-default options are good to make available, but make them easy to avoid. For example, compare the Fighter Fighting Style feature that allows various options but none of them are default. Optional features might be part of the base class or part of a particular subclass depending on theme. Non-default options include: stealth, brawler/boxer (and I assume wrestler), and wearing armor. Presumably armor swaps out the extraordinary mobility stunts, in exchange for heightened AC, and might be an option for the super-tough subclass that also has heightened saves, resistances, and immunities. Being super-tough is kinda tanky, even tho tank itself with high hit points enjoys less support.