All true, yet if able to get them for a good price, I would attempt the repair by stripping off the old foams and cleaning up the front and back cone edges - just don't use solvent to take off the old glue, it can soften the cone - just clean it off as much as you can physically. In some cases, a color matched grey spray paint can hide a lot of issues and the spray weight is very little compared to the cone itself.
This is what the L100S drivers look like - ad is still up, price dropped to $700. Would suggest that since they have been up for 2 months now, seller might be motivated to let them go for $500 under the right conditions. Personally, I'd work on stripping off the vinyl and work with a friend or cabinet maker on reveneering in a really nice veneer of choice.
The workflow would be: strip off old gaskets (in this case, non-OEM JBL anyway, remove old surrounds from frame and cone front, measure center cap, then consider cutting away if needed. Then order new surrounds, glue, and centering signal CD (rick cobb), find color matched grey paint, order new slightly larger center caps, black glue, and new old stock JBL 12" neoprene/rubber gaskets - avoid the common cheap looking laminated paper / cardboard gaskets if possible. Then carefully clean front and back of cone edge with fingers, small chisel and light wire brushes, same with frame gluing edge. Then mask off voice coil w/or w/out center cap, then spray grey paint lightly to cover any front cone edge blemishes if needed).
Would then be a good time to either paint the visible frame edge with black paint or file down for a nice metal look - these are the same 2214H woofers as in the 4425 Studio Monitor.
Then do a good job of refoaming on the back of the cone, glue on new center caps, and top with the OEM looking gaskets (seller dougie.com, no affiliation).
BTW, there are now 4410A and 4412A medium size monitors in your area, will have similar sound to L80T and L100S/T, but both come in Studio Grey cabinets, no walnut veneer.
The 4311's you purchased are exactly like the original L100, and will benefit from raising them up 10-12 inches with about a 5 degree tilt back if possible. They are acoustically equivalent to the original L100. The L100T series and the 44xx monitors are more accurate and h
Sorry to hear about the 4410's - cabinets do come up on occasion, but if you've parted them out, you've moved on to the L100S.