when you put those restrictions on them, not much...
1 &2 are easy... lots of things aren't covered by BM maneuvers or existing options in the DMG... using them all togather is good, but not great.
3 starts to be the issue, I want to see options for expanded, maybe superhuman skill use, but if we take skill mokey stuff out, then there goes there...
4 is the issue, magic refluffed is a lot of what I want... I want 'go through ressitance (like mountain hammer) I want make extra attacks (like haste) I want healing (warlord 4e or white ravon tactics Bo9S) I want some wuxa options (holcoust cloak and flame blade Bo9S) I want lots of little unque special abilities that a fighter/mage or fighter/cleric has as options but can be used without magic...
I want to make a fighter subclass (or options for battlemaster) that totally break reality... I want the story of what my fighter did as common or at least semi common feats to be things no trained warrior in the real world could do...but things a comic book or movie or novel character might do without him being 'magic spell caster'.
book of 9 swords stances and counters alone give a lot of options... lets look at some good ones
level 1
wind stride is a quick boost of speed...
Burning blade could be remade and still have a lighting or a cold equivalent
Crusaider strike is one of those healing ones
sapphire nightmare blade would have to be overhauled, but both naming and concept are cool
counter charge is a great idea
Hunter's senses are cool, but maybe stepping a bit too much on ranger
sudden leap... I can't belive 'make a jump check as a bonus action that doesn't use your move' isn't in 5e already
flame's blessing and punishing stance could both fit 5e
I just did 1st level, but there is a lot of overlap as you level up...
Baffling defense is a really good one too, make an insight check to dodge an attack could work real well with the battle master 'seeing what's coming'
4e had some good ones too...
warlord had sunder armor that lowered AC
fighter had come and get it
even just improved versions of the PHB ones as you level...
at level 3 I learn parry and ripost... at level 12 I learn how to do both at the same time... a new maneuver that when I am hit I roll my SD and take that much damage off, AND get a free or reaction attack that deals no extra damage from SD or attribute...
now my options look like this... I am attacked by 2 orcs, one misses one hits... I can A) parry the hit and remove 1d10+dex mod damage, B) ripost and attack orc that missed me for 1w+dex+1d10, or C) use this new 'meta' maneuver remove 1d10 damage from orc that hit me and make an attack against him for 1w...