I'm a contractor (avionics, so not quite so many tools) but have managed to fit quite a lot of tools all nicely laid out in foam cut outs in a very small and easily transportable toolbox. I don't know what sort of tool box your guys are using now, but maybe you don't really need to change tool kits.
I have 5 layers of tools all neatly stacked on top of each other in foam cutouts and if you count each socket as an individual tool, then I have about 100 items in my kit which measures approximately 45cm x 25cm x 25cm. I can do a tool check in about 30 seconds and can easily see if anything is missing and it cost me about $10 in foam to do it. Sometimes low tech is the way to go.
This is what I have in it:
5x Ratchet ring spanners – 1/4-5/16, 3/8-7/16, 1/2-9/16, 3/4-5/8
7x Combination spanners – 5/16, 3/8, 7/16, ½, 9/16, ¾, 5/8
Setof 7 x miniature combination spanners
Largeratchet screwdriver
Smallratchet screwdriver
Setof 8 screwdrivers
Setof 6 miniature screwdrivers
Setof 4 picks
Smalladjustable wrench
Mediumadjustable Wrench
Needlenose pliers
Bentnose pliers
Snubnose pliers
Wiresnips
Flushcut snips
Plugpliers
LockingWire pliers 6”
1/4”ratchet handle x 2
3/8”ratchet handle
6”1/4” extension
4”1/4” extension
2”1/4” extension
6”3/8” extension
Setof 11 1/4” drive sockets 5/32” - 1/2” + bit holder
Setof 9 3/8” drive sockets 3/8”-5/8” (5) + 3/8” - 9/16” DoubleDepth (4)
Setof 9 Sockets 3/8” - 5/8” in 3/8 drive (5) + 1/4” - 9/32” 1/4”drive Double Depth (4)
3/8”Driver
3/8”T-bar
3/8- ¼ step down adapter
Scissors
Magnet
Inspectionmirror
Knife
Measuringtape
Setof 7 Allen keys
3x Scrapers
Softbristle brush
6”Steel Rule
JuniorHacksaw
This is what I manage to get in my travelling tool kit and it is enough for 99% of the jobs that I need to do.
I cut my foam by hand, but there must be many companies that can CNC cut the foam for this purpose.