I can follow largely what you say with some nuances..
I'd sell all of the mentioned ones.. Would be ok with keeping Manssverk and Gaaei as squad options for now..
Gaaei looked more up for it near the end of the season and saw him do well in pre season.. Also he looks like someone with the right attitude who will always give everything on and off the pitch.. You need such players in the team as well.. I'd be ok with keeping him as backup for Rensch, who you dont mention at all in your post, but I still have faith he can be a good player for us if he can stay fit and won't be used on a different position every other match, but can focus on right back.. So I'd try to renew Rensch contract and keep Gaaei for now (though wouldn't refuse good offers obviously)..
I'd definitely get rid of Henderson if the opportunity is there.. I'm sure he has his value, but all I hear is how we should make room in the salary house and given he is by far our most expensive player in terms of wages.. He is not worth that and needs to go.. In that scenario I'd keep Manssverk I think..
I'd be very much open to sell Sutalo as well if a good offer comes in as he hasnt really lived up to expectations and can bring in significant money, but I also understand he wants to fight for his place and I can really appreciate that as well so I'd be happy to keep him in that case..
Bergwijn really really needs to go.. I want him gone more than anyone else..
Weghorst really really needs to stay far away!!!
Ramaj really needs to start in stead of Pasveer
I'd play Taylor and Berghuis together in midfield. Berghuis being the playmaker and Taylor the dynamic one who plays more vertically.. Hlynsson could compete with Taylor and I really hope we could persuade Eriksen to come back, as one who can also play als the playmaker, as I suspect Berghuis will also still be used often as right winger..
Godts------Brobbey-----Traore
------Taylor--------------Berghuis
--------------------#6-------------------
Hato-Kaplan--Sutalo-Rensch
------------------Ramaj---------------
#7/#11----Rijkhof-----#7/#11
------Hlysson-----------#10-------
-----------Vos/Mannsverk-------
Baas----#4-----Mokio----Gaeei
-----------------Pasveer--------------
I'd be happy with this scenario for this season..
For the starting places I feel we only really still need a good #6, as I want Henderson out.. If Henderson stay we dont need one.. Perhaps also a new #3 if Sutalo leaves, but if he stays we dont need one.. Berghuis is also a cover for #7 and Traore is an alternative option for #9.
I'd indeed bring in a versatile talentfull winger who can start as a backup option but has the potential to compete for starting XI short term... I'd bring in a playmaker in midfield to cover for Berghuis when he is out or playing on the right, but can also play with Berghuis in case Hlynsson Taylor arent living up.. Eriksen would be ideal! I'd bring in a backup #4 who can also compete as I think Kapaln will miss out a lot after being so often injured for so long.. We need to be careful.. (Im biased as I think he was my first real love, but can we blease bring back Jan Vertonghen for this. Dont care about his age.. He is good enough for this Ajax, he is the perfect example for young players and he breaths Ajax. Especially with Dies Jansen also entering the scene who they have quite some hopes for.. I'd also keep Fitz Jim for a bit of depth in midfield..