I’ve seen a few Thorens TD124 with cantilevered mounting boards for long arms, you could do something like this, on left, rear, right, move your existing l/r/r, get your main arm on the right side.

Rear arm on VPI Classic 4 Turntable
Has anyone ever put a rear arm on a VPI Classic 4 turntable? Does a 12 inch arm work comfortably at the back or is a 10 inch arm better? What hardware is needed? How difficult is it to install - and use?
I’m a unipivot wand arm swapper. I have 5 12 inch JMW 12 inch wand arms. I was thinking of adding a 12 inch gimbal to the right sided arm but want to preserve a 12 inch unipivot for my other wandarms.
I am turning to the community for advice because try as I might I cannot get VPI to answer my emails or calls. They seem to have abandoned customer service for some reason I do love the turntable though despite being ghosted.
Useful input appreciated!