RIP CM2250, 2013, 800,000km 20,000 hrs

[Hermjeji]

CM2250, ISX600, victim(not really, was expected). Fuel pump changed out under warranty about 5 years ago. Now... main bearing #2, 3, 4, 5, and 6 are gone. Not investigated further prior to writing this.

Live in beautiful BC (Vancouver) and operate local dumps. Trucks loaded 32 tonnes (70,000 lbs for your down south). Been following and reading up on everything, here's a summary:

1. Knew I was buying a ticking time bomb, basically got 35k off the truck. So solid deal and understood this would happen. 800k, 20K hours.
2. The one person who is remotely an option to do this build, is a logistical nightmare for me (kid on the way, house under repairs, the wonders of COVID, etc.) plus with the other 4 trucks i'm staying on top of. (me and my pop handle this, him and I run 2, and 3 have been trusted to strangers who like the same whiskey I do). 2 are ISX, (this and a CM2350 we've had since new), the other 3 are good ol purring kitties. 32k hours and 1.2 million km on those (knock on wood). So the truck got towed to a shop that i'm not overly cheery about, but the guy here who knows his shi#t is occupied for a month.
3. My options:
a. Used block, complete out-of-frame, keep system mandated (there's a campaign out for a new SCR? S/N 79622428. (~30-40k CAD)
b. re/re with a C15 (6NZ or twin depending on availability) (unknown cost, still looking into it, but i would guess 40k?)
c. Re/Re with brand new from Cummins (reduces risk of the potential issues with a build, and i get all new everything, (50-55k)
d. Option A but with demandate. Problem is it'll probably be done wrong wrt. programming, but wonder if it can be adjusted and reflashed over this forum and myself going into it.

Not looking for hoses or extra umph, just a workhorse, on this truck we pull 120k lbs on the regular.

Thoughts?