I bought this:
https://www.kregtool.com/store/c35/router-table-systems/p147/precision-router-table-insert-plate--undrilled/
then made a template on my SO2, and used it to guide my manual router using a flush trim bit (the tabletop I installed it in was too big to fit in my SO2)
bolted my old router to the underside and zip-tied the trigger buttons. The power cord goes through a table-mounted switch, which turns it on or off.
easy peazy lemon squeezy