Did you consider giving the grants to several organizers working part-time with one group?
Some arguments against:
It's more difficult to coordinate with multiple people
Organizers need to coordinate with each other
The required skillset is very rare, assuming each organizer needs to perform well w.r.t all of the skills listed.
Some arguments in favor:
Low transferable career capital (outside the EA community). Some potential candidates expressed concerns that working full time would require them to interrupt their studies. Working part time would mostly just mean they would quit their student jobs (e.g. as tutors at the university), which has significantly lower opportunity costs. Offering part-time positions might therefore result in more high-quality applications.
Tax considerations (In Germany and likely even more in Scandinavian Countries). In Germany, with an income of 35000€ per year you'll have to pay about 5000€ in taxes. Three incomes of ~11650€ result in 0€ in tax payments. The average income of a student in Germany is 918*12=11016 (according to the German social suvey 2016 -http://www.sozialerhebung.de/index_html/documents/englisch).
Cerasoli, C. P., Nicklin, J. M., & Ford, M. T. (2014). Intrinsic motivation and extrinsic incentives jointly predict performance: A 40-year meta-analysis.