Consider this rule and the several statutes' sections and other rules this cites:
https://www.ecfr.gov/cgi-bin/text-idx?SID=55842d869c1e469dad9d00e37cea9aff&mc=true&node=se29.9.2530_1200b_61&rgn=div8
Consider also whether imposing as allocation conditions not only 1,000 hours in the year but also a last-day condition might help accomplish some of what the sponsor seeks.
But also test it for coverage and non-discrimination.