Interative count with date comparison using Direct Query

Hello!

I am currently switching a model over to direct query and encounting a problem with one formula, but it's an important one. My current model calculates the average number of people working during any selected timeframe. This is calculated by taking a daily count of all people employed and dividing it by the number of days. here is the formula that works in PBI NOT in DQ mode:

Average Active Assignments = 
roundup(
	divide(
		sumx(
			CALCULATETABLE(Assignments,ALL(Dates),Assignments[HeadcountFlag]=1),
			COUNTROWS(
				FILTER(
					Dates,
					Dates[Date] >= Assignments[Worker Start Date] && Dates[Date] < Assignments[Worker End Date] && Dates[Date]<=now()+1
				)
			)
		),
		CALCULATE(
			COUNTROWS(Dates),
			FILTER(
				DATES,
				Dates[Date]<=NOW()+1
			)
		)
	),
	0
)

The problem I am finding is that DQ does not allow you to compare the dates with each other, only one column is allowed for a TRUE/FALSE comparison. I've been trying to find a way around this and have yet to find something. Does anyone know of a work-around?