Tightening oil return line fittings

My RANS FWF kit came with oil lines with straight fittings for the two oil return lines at the bottom of the crankcase.  I am having a heck of a time tightening these lines.  The right side line was doable, but I have not been able to get a wrench of any kind on the left side due to its proximity to the muffler and header pipes.  I have tried regular crow foot wrenches, a thinner flare nut crow foot, but this won’t fit over the hose with its fire cover, a stubby wrench, etc.  Anyone have a clever way to do this?

I was going to remove the muffler, but it is bolted to the turbo housing with 6 nuts on studs, and the nuts are so close to the housing that I can’t get an open end wrench over them.  It looks like I may be able to remove the left rear header pipe to gain access, but it looks like that uses special locking nuts that likely are one time use only so I will need to order new header nuts if I go that route.

Any clever solutions for this problem?