I don't think your belt will have a straight shot from the tensioner to the alternator without the bearing bracket pulley in place. On the off chance that the belt will clear the crank pulley you will have significantly less belt engagement on the alternator pulley. Additionally the lower bolt on the drivers side of the bracket is shouldered and seals an o-ring against oil leaking out the timing cover.

Anything is possible but this doesn't strike me as a great idea. Addressing the cooling system problem(s) which may not even be airflow related will likely be much simpler than re-inventing the wheel.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff