Wahey! If you don't want to use the Custom Bounce Blocks patch you can just set the blue block's bounce value to $AF and the red's value to $35. These are values outside of the normal range that coincidentally use the right tiles and palettes, they don't seem to bug anything else out.
Remoderated patch. Actually I didn't do anything (besides the gifs ), it was LX5 who made the conversion and tried to teach me how the Bullshit™ needed for this patch works (it's not the common way to set/find freespace... or something like that).