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Do you have a UPS unit handy?  They often include noise filtering, you could plug the monitor into the UPS and see if that helps.  I have some high end LED bulbs in some of my lamps, and they will flicker sometimes when on their lowest setting if other large motors are running  in the house...

Sounds like the fan bearing is worn.  Is the fan in a standard form factor and voltage?  If so you can search for a quiet (lower dBA) fan of the same size and voltage with a suitable CFM rating.  The worst part of the process may be getting the housing open if it doesn't use standard fasteners...

There didn't happen to be a loose screw or other piece of metal rattling around in the case?

Do you have a DMM?  You could check the traces for continuity, just use a light touch so you don't accidentally make a broken trace look good.

Have you tried booting the diagnostic disk?  There is a RAM test on it.

I've used a product called Plast-aid to make repairs to plastic items.  It is a two part system with a plastic powder that you mix with the solvent that is moldable for a period of time that can be used to reattach parts together or even to shape a new piece.  When it hardens, you can file or...

C4 and C5 measure 6.8 nF in circuit with my Smart Tweezers. C1, C2 and C3 measure about 300 nF, which means they may be three 100 nF caps in parallel. IC X3 is marked as a LD33C, which is probably an adjustable voltage regulator, but I'm not turning up a datasheet based on that marking code...

D1 is a red LED that does light up.  And yes, there is a silk screened arrow marking the correct orientation of the card (arrow towards the front).

I have the ByteBoosters RAMGS-4MB/XLP version, there are five surface mount capacitors on it, so it is unlikely the 47 uF ones you have will fit.  If it is getting hot near the jumpers, and if your board is similar to mine, then C1, C4 or C5 could be suspect, as well as ICs X3 or X4.  You might...

Shorted capacitor on the memory board dragging down the power supply voltage?

I know you have the ReActive Micro card, so this will not be helpful, but the CFFA lets you use FDD images directly mapped as virtual FD drives.

CFFA3000 cards are currently available, looks like about 200 in stock as of 10 days ago.

Keep in mind you have to calculate the maximum allowable package temperature, which will be lower than the TJMax value, due to the thermal resistance of the package.

It would depend on whether the appropriate drivers were present in OS 9.  At least one company was selling this card labelled as usable in a Mac. https://www.bhphotovideo.com/c/product/492803-REG/SIIG_JJ_PC1M12_S1_PCI_to_PC_Card_M.html

I'm thinking it looks like surface mount with the remains of the legs on the pad?  There isn't a real obvious via at pin 13, but if the output of the gate on pin 11 isn't being used, then you could tie pin 13 to pin 12 to keep that input from floating.

I don't recall if on the older Macs the Mac itself used SCSI ID 0 for the controller.  What ID is your external HDD using, perhaps trying an ID other than 0 for the SCSI2SD would work.  Also, make sure you have the correct number of terminators enabled, too many will definitely cause problems.

I have a switched Mac to VGA adapter and to use it with my Quadra 631CD and a Viewsonic LCD monitor switches 1, 3 and 5 are on and the others are off.

It is unlikely that the cap will explode due to the heat used to desolder it, they explode due to electrical shorts developing and large amounts of current flowing through them.  You do need to take caution that the heat you are applying does not cause the pad and trace to lift off the board. ...

By the way, if you do decide to try installing Debian on the second disk, I ran into a yaboot configuration file bug.   I reported it as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=846032. Basically the context diff that produces a working boot from the second disk is: 10c10 < ...