I agree with Tom Doan.
I can see one good option (#1), one definitely flawed option (#2), two options that initially seem okay but have a significant flaw (#3 and #4), and an option that might initially seem okay to some but has significant flaws (#5).
Option 1 5-0=$100, 4.5-0.5s=$375 each, remaining $50
(both mathematical options result in the same values)
mathematical option a) Give the 5-0 $100 of first, move the $400 to second, change the resulting $650 in second to $500 (no more than the original first), move the $150 to third, change the resulting $300 to $250 (no more than the original second), create fourth for $50, award the 4.5s the top two remaining prizes ($750 to be split two ways)
mathematical option b) Find the lowest prize that still covers the cap (third’s $150 in this case), leave the other prizes alone (first and second), create fourth with the $50 balance from the $150, award the 4.5s the top two remaining prizes ($750 to be split two ways)
Option 2 5-0=$100, 4.5-0.5s=$400 each, remaining $0
Award $100 of first and push the remaining $400 to second, award the two 4.5s the $800 to be split two ways
This uses 32C6 #3 while ignoring that players cannot get more money than they would have gotten if some players didn’t play
Option 3 5-0=$100, 4.5-0.5s=$325 each, remaining $150
Award $100 of first, leaving the $400 balance for a prize coming ahead of second, award the two 4.5s the top two remaining prizes ($650 split two ways) while $150 remains for the next prize group
This uses 32C6 #3 and is somewhat defensible because $400+$250 is significantly higher than $250+$150 but it pays little attention to the primary reason for having prize limits (minimizing the impact such limited players have on other prize winners)
Option 4 5-0=$100, 4.5-0.5s=$340 each, remaining $120
$100 is 20% of first, so the two 4.5s bring in two prizes [80% of first + 20% of second] and [80% of second plus 20% of third] so that they split $680 and 80% of third remains
This uses 32C6 #3 and is somewhat defensible because $400+$250+$30 is significantly higher than $250+$150 but it pays only moderate attention to the primary reason for having prize limits
Option 5 5-0=$100, 4.5-0.5s=$200 each (2nd and 3rd), with the remaining $400 (from 1st) to be used to create various place prizes, each less than $150 (maybe $125, $100, $75, $50, $30, $20)
The 5-0 took first but is limited to $100. The 4.5-0.5s took second and third and receive that. 32C6 says to put the balance of the limited prize back into the section but 32C6 #4 is inapplicable because there are no other 5-0 players, so brand new prizes are created with the reallocated money (32C6 #3 requires it to be place prizes and not under or class prizes). This completely ignores the primary reason for having prize limits