Ok, so seemingly the absolute minimun starting CL needed too allow us to reach 1750 CL is 1000.
Nano can actually do this at 214 bc they would be starting with 1017 CL. (992 at 213)
Atrox can only do they after LvL 217.
Opifex and Solitus can reach 1750 CL starting at lvl 215.
Also, you have to take into account the CL or int you are losing for the piece of equipment you are putting on.
(4 pts. of Intelligence = 1 pt. of CL bc 100% dependency)
I will be using a 215 Opifex shade as an example.
----------------Opi Soli Atrox Nano
LvL 220 - CL - 1130 1134 1089 1167
base Int maxed - 764 780 600 912
base CL maxed - 939 939 939 939
LvL 219 - CL - 1107 1111 1067 1142
base Int maxed - 749 765 590 892
base CL maxed - 919 919 919 919
LvL 218 - CL - 1083 1087 1044 1117
base Int maxed - 734 750 580 872
base CL maxed - 899 899 899 899
LvL 217 - CL - 1059 1063 1022 1092
base Int maxed - 719 735 570 852
base CL maxed - 879 879 879 879
LvL 216 - CL - 1035 1039 999 1067
base Int maxed - 704 720 560 832
base CL maxed - 859 859 859 859
LvL 215 - CL - 1012 1016 977 1042
base Int maxed - 689 705 550 812
base CL maxed - 839 839 839 839
Spirits
Somber Essence Brain Spirit - 56 int
Dispirited Spirit of Essence - 33 int
Sorry Spirit of Essence Whispered - 25 int
Perks
Ncu Extensions 8 - 100 cl
Genius 3 - 40 int
Enhance DNA - 45 int
Opi Secondary Genome 10 - 24 int
Ultilities
6x Spiritech Network Analyzer - 36 cl
Intuitive Memory of the Aquarius - 12 int
Armor
Experimental Cyborg Token Board - 200 CL, 5 int
Advanced Head Skinchip - Temperature Modification ql 200 - 10 CL
Pioneer Backpack - 1 int
Repair Coordination Assistant - 10 CL
Virral Triumvirate Egg - 15 int
Breastplate of Azure Reveries - 8 int (or sent, or oaf)
2x Sekutek Chilled Plasteel Armor Sleeves - 10 int
Strong Mittens of the Sagittarius - 40 CL
First Creation of the Sagittarius - 10 CL, 10 int
QL 250 Control Unit Crepuscule Pants - 21 CL (ql 300 gives 25)
Gemini's Double Band of Linked Information - 20 CL
2x QL 200 Soft Ring with Fluff - 24 CL
Cancer's Silver Boots of the Autodidact - 25 CL
Buffs
Comp Attribute Boost - 12 int
Comp Lit Expertise - 20 CL
Neuronal Stimulator - 20 int
Weapons
2x ql 44-76 Galahad Inc T70 Beyer - 40 CL
Misc
Grid House Computer Literacy - 58 CL
Large Org HQ Management Benefit - 9 Int
Tutoring - 50 CL
Add it all up as a 215 opifex
CL - 839 + 100 + 36 + 200 + 10 + 10 + 40 + 10 + 21 + 20 + 24 + 25 + 20 + 40 + 58 + 50 = 1503
Int - 689 + 56 + 33 + 25 + 40 + 45 + 24 + 12 + 5 + 1 + 15 + 8 + 10 + 10 + 12 + 20 + 9 = 1014
1014/4= 253.5 ~ 254
1503 + 254 = 1757 CL
What this means:
On RK2 Clan at least, you can only bid on the belts (and maybe pande armor too) at lvl 215+, so as soon as you can get it, you can wear it.
P.S. - the only things that I know of that will get you more CL than this would be higher QL head/ear/eye spirits, higher ql Control Unit Crepuscule Pants, or more levels
**I believe all these items are in game, please post if you see any need for corrections**