Regular 3" bend vs. 4" x 3" closet bend - toilet rough-in

[jmterail]

Installing a toilet in a joist bay, so space is limited.

I would ideally use a spigot closet bend (like this: https://www.homedepot.com/p/4-in-x-...got-x-Hub-Closet-Elbow-C58072CLHD43/100343148) , cut down to level, and add a 4" hub flange.

Unfortunately, up in Canada for some reason I cannot for the life of me find a spigot closet bend like that anywhere (big box and plumbing supply).

Best I can find is a hub x hub closet bend: https://www.homedepot.ca/en/home/p.90-degree-closet-elbow-hxh-abs-dwv---4x3.1000678412.html

But problem with that is:

a) it seems that spigot 4" flanges don't exist in Canada (90% of what's for sale are 4 x 3 flanges, most with hubs)
b) I have no room for a pipe stub to mount a 4" hub flange, and
c) even if I could find a spigot 4" flange, there's no way to cut this bend to adjust it to the correct height.

Since 90% of the flange options out there are 4 x 3 hub, ideally I could just use a regular 3" street 90, instead of a closet bend.

I know that vert-horizontal with a regular 90 is a no-no in most cases - but are closets different? Surely it would be no tighter than the closet bend?

TY!

 

[frodo]

install 4x3 hubxhub closet 90 like you show
install a pup piece of 4'' pipe inside the hub of the 90
cut the pipe level with the finished floor
a 3'' closet collar. one that goes over 3'' pipe
will fit snug inside a 4'' pipe

you are using a pipe as a bushing

or

if real tight,,,install a 3'' street 90
with a coupling glued on the street end. looking up
cut the coupling off level with finish floor and install a 4'' collar over the coupling
with a 2'' piec of 4'' glued inside the 4'' hub
again,,using a pipe as a bushing