I could... and am usually VERY inclined to say something smart-azz like... give them a govt mandatory DNA-Altering vaccine that will cause them to be immune to bad blocking...
... but for real, the best thing I can practically say is to teach those 1500 level players how to block. From your accumulated empirical evidence, this would seem pretty far fetched... but it really isn't.
When I was 1500 level, I could block real good, except for heavy slow, then I learned that soon enough when someone showed me how.
From my empirical evidence, it IS POSSIBLE for that level of player to learn.
The key is getting to the ball early (better with a small step - one step footwork) taking ball off the bounce with a loose grip, looser than one would think is needed...
... when a player is this close, he or she USUALLY can unconsciously see the ball better and make instinctive bat angle adjustments...
... also... these adjustments are not needed as much if the impact is soon after the bounce, like a few inches... the difference in bat angle is not as much at his distance... if blocking a foot or more... then there are HUGE differences in bat angle and touch required.
... that is why I say to a lot of adult players to just get the bat to the ball with a loose grip, even if they need to reach a bit (but much better to use one step footwork)... it will be stable enough to get the ball back with directional control.
... for the players who have extreme slow loop heavy spin, they can learn to close the bat a little more taking the ball real early... it is amazing how one can control those balls.
Just having that one skill of blocking makes a 1500 level player SO USEFUL to advanced players in hte club.
I always advocate for adult learners (who are usually in this 1500 USATT range or near) for them to learn how to block well with directional control. This puts them in a position to be much more welcome in a club with better players just about anywhere and be able to fruitfully participate with those players.
Of course, every better player should be willing to spend time with lower skilled players... but Tim honestly and correctly articulates the view why more advanced players will not spend time on the table with lower skilled players... they are not doing anything for the better player.
Personally, I have had a lot of this... and my perosnal experience has been to allocate more time with this crowd teaching... It is time well spent... many get better in one or more aspects...and I learn how to be a better coach.