Oh, goodness, no. I've already been through this madness once. Though I am tempted to list out the Flashes of 52 worlds just to see if we can figure out who Morrison is writing for Multiversity Too. All I've gathered so far is that it's a Barry Allen.
0 - Barry Allen (New 52)
1 - Barry Allen (as done by JMS)
2 - Jay Garrick (New 52)
3 - Johnny Quick (New 52)
4 - Unknown (possibly none)
5 - Unknown (possibly none, though there seemed to be hints of a Shazam/Speed Force connection back in the 90s)
6 - Mary Maxwell (as envisioned by Stan Lee)
7 - Unknown
8 - Unknown (maybe a Quicksilver pastiche)
9 - Lia Nelson (Tangent)
10 - Blitzen
11 - Jesse Quick
12 - Danica Williams (Beyond) (its past should have DCAU versions of Jay and Wally)
13 - Unknown
14 - ???
15 - Unknown
16 - Wally, Impulse (resembles the 1990s versions)
17 - Atomic Flash
18 - Trigger Twins (Western)
19 - Accelerated Man (Gaslight)
20 - Unknown
21 - Barry Allen (resembles the Silver Age version)
22 - Wally West (Kingdom Come)
23 - Unknown
24 - ???
25 - ???
26 - Fastback (funny animal)
27 - ???
28 - ???
29 - Bizarro Flash
30 - Soviet Flash (though Barry is around)
31 - Unknown
32 - Aquaflash (Amalgam)
33 - Probably None
34 - Formula One ("Astro City")
35 - Mercury Man ("Extreme Comics")
36 - Red Racer
37 - Unknown
38 - This world had a bunch of Flashes, including a traditional Jay Garrick (resembles classic Golden Age) and Barry Allen (resembles classic Silver Age)
39 - Unknown
40 - Unknown
41 - Unknown
42 - Lil' Flash
43 - Unknown (probably a vampire)
44 - Mercury Flash (Metal Men)
45 - Unknown
46 - ???
47 - Speed Freak
48 - Unknown
49 - ???
50 - Justice Lords Flash is dead.
51 - Unknown.