I'll show you how I'm doing this for those of you who know your way around Cheat Engine. This is how I am replacing my lethal grenade for weapons in Custom Class 1.
1-byte 02F00220 - Custom Class 1 Lethal (use a value in the list below)
1-byte 02F00221 - Custom Class 1 Lethal Amount (set at 01)
The lethal address determines what weapon is used in place of the lethal equipment, and the lethal amount address determines the amount of ammo. For ease of use, just leave the value of the lethal amount at 1. Here are some of the values that the value of the lethal address can be replaced with. As you can see, you can replace the lethal grenade with weapons, other lethals, tacticals, perks and even scorestreaks. However, I haven't been able to get any of the scorestreaks to work yet.
3 - Tac-45
4 - B23R
5 - Executioner
6 - Five-Seven
7 - KAP-40 Dual Wield
8 - TAC-45 Dual Wield
9 - Five-Seven Dual Wield
10 - Executioner Dual Wield
11 - B23R Dual Wield
13 - MP7
14 - Skorpion
15 - PDW-57
16 - Chicom
17 - MSMC
18 - Vector
19 - Peacekeeper
24 - M8A1
25 - SCAR
26 - AN-94
27 - SWAT-556
28 - Type 25
29 - FAL
30 - SMR
31 - M27
32 - MTAR
36 - MK48
37 - QBB LSW
38 - LSAT
39 - HAMR
43 - SVU-AS
44 - DSR-50
45 - XPR-50
47 - R870
48 - M1216
49 - S12
50 - KSG
53 - SMAW
54 - FHJ-18 AA
55 - RPG
57 - Assault Shield
58 - Crossbow
59 - Ballistic Knife
61 - War Machine
63 - Grenade
64 - Combat Axe
65 - Semtex
66 - C4
67 - Bouncing Betty
68 - Claymore
70 - Smoke Grenade
71 - Concussion
72 - EMP Grenade
73 - Sensor Grenade
74 - Flashbang
75 - Shock Charge
76 - Black Hat
77 - Tactical Insertion
78 - Trophy System
81 - Combat Knife
82 - Death Machine
84 - Knife
148 - Lightweight
149 - Flak Jacket
150 - Blind Eye
151 - Hardline
152 - Ghost
153 - Hard Wired
154 - Scavenger
155 - Cold Blooded
156 - Fast Hands
157 - Toughness
158 - Dexterity
159 - Engineer
160 - Dead Silence
161 - Extreme Conditioning
162 - Tactical Mask
163 - Awareness
198 - RC-XD
199 - UAV
200 - Hunter Killer
201 - Counter UAV
202 - Care Package
203 - Guardian
204 - Hellstorm Missile
205 - Lightning Strike
207 - Sentry Gun
208 - Death Machine
209 - War Machine
210 - Dragonfire
211 - AGR
212 - Stealth Chopper
213 - Orbital VSAT
214 - Escort Drone
215 - Warthog
216 - EMP
217 - Lodestar
218 - VTOL Warship
219 - K9 Unit
220 - Swarm
221 - Gunship