oh shit
I am so trying that when I have the time
only instead I'm gonna use Larsa's first theme instead of the Ketsui TLB mentioned :V
Oh my god, wow.
That was the most fun I've had playing Touhou in months.
After that I played PCB stage 3 to Mushifutari Stage 1's theme, with the usual boss theme for Alice. It almost seemed perfectly timed to the action in the game.
I think I'll play like this more often!
EDIT: I (attempted) to play a full game using a custom soundtrack and 90fps speed.
The tracks I used, if you were interested:
Stage 1: 'Sea of Frozen Crystals' [Mushihimesama Futari Stage 2]
Letty: 'Levi=Sense' [Mushihimesama Boss theme]
Stage 2: 'Degeneracy' [Battle Garegga 'Plant' stage]
Chen: 'Thrust and Thrash!' [Battle Garegga Surface Boss theme]
Stage 3: 'Subversive Awareness' [Battle Garegga 'Cloud' stage]
Alice: 'Bestial Beat' [Mushihimesama Futari Boss theme]
Stage 4: 'Like the Night of Falling Stars' [Mushihimesama Stage 4 theme]
Prismriver Sisters: 'Severing the Chains of Fate' [Trauma Center: Under the Knife 2 Final Operation Theme (by Manabu Namiki, if you couldn't make the connection

)]
Stage 5: 'Floating Castle Utsurobune' [Espgaluda Stage 5 theme]
Youmu: 'Burn Yourself' [DoDonPachi Dai-Ou-Jou Boss theme]
Stage 6: 'On the Verge of Madness' [Mushihimesama Futari Stage 5 theme]
Yuyuko: 'Cry! Scream!' [Mushihimesama Futari Final Boss theme]
Yuyuko's 'Perfect Cherry Blossom of Sumizome' and 'Resurrection Butterfly': 'Sky of Fragrant Souls' [Mushihimesama Futari Spiritual Larsa theme]
I didn't 1cc it, but damn it, it was a ton of fun.