Hate to say it but tend to side with Hurst. Almost every other sport I have seen or been involved with have multiple coaches working with a team, and, as a rule, they are smaller in size.
Can practice times overlap when you just might have only strikers or defenders there working on specifics? Simple example: 0-30min strikers, 30-90min team, 90-120min defenders. Positions can rotate based on what is needed or being worked on.