Started playing BW again after many years of absence, I noticed that many Terrans in TvP open with >rax>CC >bunker instead of 1 fac > tank > mine CC I am used to. So I practiced this BO and I liked it alot even tho you haft to waste alot of minerals and SCVs for repairing the bunker.
One time I built an early academy and researched range for the marines, just for fun. The range is done around 1min earlier than the normal build with tank , so the SCVs can spend less time repairing. Discoverd this was actually pretty good for the economy.
1 SCV repairing 1min ~ 90 minerals cost
1 SCV not mining 1min ~ 72 minerals lost
Since you usually need 4 SCVs to repair versus a 2gate Protoss, you will be spending around 500 minerals for the repairs and mining time lost, So you trade 150minerals 150gas on range cost for ~500minerals.
BO: sup > rax > CC > hold SCV production at 15 > Refinary > academy > SCV > Marine > sup > bunker
With this build you get later factory, but faster comsat station, and its fun to watch the Protoss struggling with his dragoons, wondering why he cant get them in shooting range without getting hit by the bunker
Maybe you can make this build more worth if you go for a M/M push later on, extra bunker with marines guarding your third, or just making the protoss fear you are going for a M/M push.
Try it out and see what you think, have fun!