On reels used for fishing for azure fishing, grease is currently used on the gears, but is it possible to use undiluted Bell Hammer Gold on the main gears (eliminating the grease)?

You said that you specialize in fishing with light weights, so I think there should be no problem using only LS Bell Hammer Gold spray or undiluted LS Bell Hammer Gold on all reels where grease is applied.
For areas where a little friction or dampening is needed, LS Bell Hammer Gold Grease No. 0 may be a good choice.