WORLDEDIT / WORLDGUARD - How to allow players on our aternos server to use full unlimited worldedit but ONLY in selected regions protected by worldguard?

Dear ATERNOS team and the community,

I have a question that I'm struggling with my friends to get an answer to. The only one last 'x' that we need solution for to be fully able to play and be satisfied with aternos hosting.

Basically: just as in the title; how can we (on our aternos server session with our uploaded precious world) let other players (especially newcomers who may not be fully trusted at first..)
let have full unlimited access to worldedit BUT ONLY in selected regions protected by worldguard?? So that they are NOT able to work with worldedit across entire world but only they are able to work with worldedit in selected region protected/limited by worldguard (set by us OPs).

Also the thing is: the only way that we know of to enable to players the ability to use worldedit is to give them OP on: https://aternos.org/players/.
But that's also another point: How to enable players to use full unlimited world edit without making them OP??
Is there any way to give a player full access to worldedit without making them OP ?? How to do that?
All our attempts and tests ends up with a failure at this point as once we make somone OP, all the protection of worldguard can be bypassed (by an op)

Questions shortcuts:
1.) How to allow players on our aternos server session to use full unlimited worldedit but ONLY in selected regions protected by worldguard??
2.) How to enable players to use full unlimited worldedit without making them OP??

For the record, just to clear it out of the way. The worldedit as well as worldguard works perfectly fine so as everything else we need and want on the server and we do know how to use them.
It's just how to get around the above. We truly did seek for answers in multiple sources but with no success so we thought turning to you here would be our good shot. If the thread is already there somewhere, please do excuse me, forward a link for us and close the post immediately.

(we do have minecraft premium and we only use 2 plugins: worldedit & worldguard)

(please do not send us away by dismissing the questions by simply saying to us not to give w.e. to untrusted newcomers because we've heard it before elsewhere and it's not why we came to ask here. There are many
newcomers who often are highly skilled and use of worldedit is a must-have! but still.. certain protection overall desired..)

I'm highly hoping for your kind response with the solution.
Any help, tips, explanation, link video-tutorials, wiki, commands / plugins suggestions would be very appreciated!
I do feel like the solution is ridiculously easy, sooo close and just right around the corner but just can't get there yet. Pls help!

Much obliged;
Aternos user: B4zuM
[email protected]

Thank you Roman for replying. You helped out resolving the 2nd issue for us. Pex did do it. But the 1st and most important issue still remains unsolved and I'd like to again request if anyone kindly could be of an assistance.
I made another thread which also contains another query.
How to give a new player worldedit but only to work on their assigned plot - not on the whole world?
Many thanks:
Aternos user: B4zuM
[email protected]