They have the F-15E, which is probably the best small bomber available. It would be too expensive for them to develop a new bomber, given that they would need to rely on the U.S. or Europe for engines and other major parts.
They already have 250lb version of the SPICE munition, but its significantly more expensive than U.S. weapons.
It would still be a very good idea to have some larger bombers on hand. There has been circumstances in recent years where they would have been very handy.
Which kind of makes me wonder why there doesn’t seem to be any rocket-assisted SDBs? Drop it from a bomber, then the rocket takes it up to a much higher elevation, then disengages, giving it a longer glide path to target. It is pretty well known technology.