Plumbing Help

I'm doing a little plumbing for my filter system based on some inspiration
from Netmax's website. OK, I'm stealing it wholesale. I even printed out
his sketches to work from. They say plagiarism is the sincerest form of
flattery 8-).

The problem is: I'm working with 3/4" PVC, 3/4" hose barbs, and 3/4" hose.
Unfortunately, my Ehiem 2026 uses 5/8" (16 mm) ID hose. Of course, I missed
that little detail until I had the whole thing built up. At least I don't
have it all glued together yet. I was at least smart enough to do a fit
check.

I don't see a way to convert the filter fittings to 3/4" (19 mm), and I have
not been able to find 5/8" hose barbs in PVC. I'm pretty sure I could turn
down the 3/4" hose barbs to fit 5/8" hose if I still had access to a lathe.
The fittings on the filter do not look like they will work with a bigger
hose, and Eheim does not seem to offer a version that accepts larger hose.
At this point I am pretty much stumped.

Has anyone else solved this problem? Any suggestions from the peanut
gallery?

Joe