We take an inexpensive spin indexer (spindexer) and flip the spindle around to gain much needed clearance. Also install thrust bearings to making the spindle spin smoothly.
Check out my inspiration at https://bbs.homeshopmachinist.net/forum/general/61409-modified-spindex
Making of my Boring Bars https://youtu.be/FwKr_87fT8g
Making of my Mini Jacks https://youtu.be/kO_f5zqulnc