You can still try without trancing him.
Try using a similar technique that you did with standing him up, except have yourself literally against him for support.
I check Wick’s area-down-there every day since his neuter actually, even though it’s long after because sometimes I’ll find a poop stuck in fur haha. I lean down next to Wick so I’m side to side, my head touching his. I use one hand and slide it under his front paws, then hinge my body up (with my body remaining in contact with his) to stand him up. Then I’ll use my other hand to lift up his feet just enough so I can position at angle to see the site. He is practically still standing vertical, but is only 1in off the ground and my upper body is still against him the entire time for support.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.