I think you described Eriksen, versatile players, deep playmakers and played his best form is in right midfield like Pogba is in left midfield with Matic behind protecting at back and Eriksen has a lot of attributes that are similar to Herrea's ability to man-mark, the aggressive and the interception but better playmakers, bit less defensive compared to Herrea and have a good passing, he is superior to Ozil in 3 midfield and is one of the hardest, strongest runners, the power. Pogba and Eriksen can take it in turns with free license to attack and express themselves, one of them have to cover a missing huge space left for opponents to exploit but Matic can't do all alone. We can't depend on Pogba for his creativity only because if opponents knew that he is probably most threatening to goal with his creativity, they would mark him to shut down all of his creativity. Having enough creative player in the team would cause trouble for opponents and impossible to mark all of them. Ozil can operate as a wing in 4-3-3 with Pogba, Matic and Eriksen together in 3 man midfield or as ACM/Roam behind two strikers (Martial/Rashford and Lukaku) with Pogba, Matic, and Eriksen to control the midfield in 4-3-1-2 with fullback providing attacking width and crosses. With Ozil, Pogba, Eriksen can dramatically improve our attacking and turn it into free-flowing and increase the amount of chance created by huge. Ozil would be upgraded on Mata and upgrading Herrera to Eriksen level would be best for United, if one of three injured, two can cover creativity. It would be hard to find a replacement for Pogba if their quality is similar and doubt they would want to come to join our bench.
Herrera vs Eriksen vs Mata vs Ozil
Successful Passes: 31.94 / 44.80 / 34.59 / 58.41 pass per match
Chances Created: 9 / 47 / 31 / 59
Key Passes: 8 / 42 / 28 / 54
Interception: 25 / 11 / 9 / 10
Total forward pass: 383 / 598 / 328 / 689
Tackle won: 21 / 14 9 / 12
Clearance: 13 / 14 / 7 / 6
Ariel dual won rate: 36.36% / 37.50% /33% / 11%
Herrera can give United much more protection in defensives after up goals instead of risking to gift them a goal. Herrera would be perfect sub for Ozil or Eriksen, let's say, if come in for Ozil, Herrea would take Eriksen's position as CM in 3 midfield then Eriksen can cover Ozil's position and if come in for Eriksen, Ozil will stay in this position but if Herrera comes in so that means Pogba won't need to take it in turn so can attack with free license and protected by Herrera and Matic
Not to mention that our attacker is more crucial in converting chance into a goal (22%) out of 229 chances compared to Liverpool - 17% out of 297, Arsenal - 14% out of 277, Chelsea - 15% out of 266, Spurs 15.3% out of 255, only City is better at converting chance into goal than us 22.2% out of 276 chances but with Ozil, Eriksen and Pogba together in the team could increase the amount of chance created and a key pass, that will give attacker better service compared to Mata, Mhki and Herrera and could score more goal than they are now.