JLS says this might be possible, and there's a simple domino trick afterwards.
x=31, y = 13, rule = B3/S23
27b2o$27b2o$7bo$5b3o17b4o$4bo10bo8bo2bo$b2o2bo10bo4b2o2bo3bo$o2b2obo6b
5o2bo2b2ob3obo$b2o2bo10bo4b2o2bo3bo$4bo10bo8bo2bo$5b3o17b4o$7bo$27b2o
$27b2o!
-wwei23, 7/16/2021, 4:27 PM NY time
Random thought: Adding snakes to the xs20 would allow them to be retained through the transformation. That way, instead of having to create the inducting blocks from scratch, the snakes could hold the transformed still life together and then later be mutated into blocks. -wwei23, 7/16/2021, 10:26 PM NY time