Well...hmm. Let's see if we can make this work.
Although Swiftblade builds are overwhelmingly arcane, I don't see anything in the requirements that says they have to be arcane. It's just that most divine casters can't swing Haste in all their third level spell slots. So let's see what we can do with a strongly martial divine-powered Swiftblade.
Human
Stat Priority: Charisma, Constitution, Strength, Dexterity, Intelligence, Wisdom
1. Crusader 1: Furious Counterstrike, Steely Resolve 5, Magical Training, Power Attack
2. Paladin 1: Aura of Good, Detect Evil, Smite Evil 1/day
3. Paladin 2: Divine Grace, Lay on Hands, Dodge
4. Paladin 3: Aura of Courage, Divine Health
5. Paladin 4: Turn Undead
6. Crusader 2: Divine Might, Indomitable Soul
7. Crusader 3: Zealous Surge
8. Divine Crusader 1: Domain (Time,) Aura, Improved Initiative
9. Divine Crusader 2: Mobility
10. Divine Crusader 3: Resistance to Electricity 5
11. Swiftblade 1: Spring Attack, swift surge +1/+0 ft.
12. Swiftblade 2: Blurred alacrity, Feat
13. Swiftblade 3: Sudden casting
14. Swiftblade 4: Arcane reflexes, swift surge +1/+10 ft.
15. Swiftblade 5: Evasive celerity, Feat
16. Swiftblade 6: Fortified hustle
17. Swiftblade 7: Bounding Assault, swift surge +2/+10 ft.
18. Swiftblade 8: Diligent rapidity, Feat
19. Swiftblade 9: Perpetual options
20: Swiftblade 10: Innervated speed, swift surge +2/+20 ft.
BAB: +19
Fort: +13
Ref: +10
Will: +12
PROS: Swiftus has formidable Charisma synergy--Divine Grace, Charisma-based divine spellcasting, Charisma to Initiative (Magical Training provides me with the ability to cast three 0-level arcane spells as a sorceror--I look at it as a much-better Improved Initiative that doesn't pay off until 14th level,) and Divine Might. Unlike most Swiftblade builds, he has both Innervated Speed AND ninth level spell slots; the six levels of caster advancement provided by Swiftblade is just enough to get him to 9th level Divine Crusader spellcasting. His saves and BAB are extremely strong.
CONS: Well, let's acknowledge the biggie: Swiftus is going to be casting Haste and Time Stop and that's about it. Most of his other domain spells simply aren't useful to him. It'll be nice to have a Contingent haste, and the True Strikes and Foresight should come in handy. He may even throw a Legend Lore now and then, but his level 4, 5, and 6 slots are going to be almost exclusively tied up with Haste spells. The Swiftblade d6's for hit dice make me a little flimsier than most Crusaders.
REFINEMENTS: Taking the Holy Warrior ACF from Complete Champion would allow me to swap the single Paladin spell slot for a feat, but there aren't a lot of juicy ones on the list--something to consider.
QUESTIONS: Here's the part where I'd really like suggestions.
1. What feats would best round the character out at 12th, 15th, and 18th level?
2. What maneuvers should I take? (I'm NOT a Bo9S guru, so I could use significant help here.)
3. Is there a one or two-level dip prestige class I could stick in around 9th level to get a bonus domain and make Swiftus' spell selection a little more versatile?
Any feedback is appreciated!