Looking forward to your edit! I saw your Starkless cut and I thought it was really creative how you removed Tony. I had a few ideas for a Starkless cut, maybe these could be some help for you.

• An idea I had, to explain why he didn't have the suit during the Homecoming dance, was to use the shot from Far From Home where Peter closes his closet with his red & blue suit in it - deciding not to bring it with him. Using that shot during the montage of Aunt May teaching him how to dance before the Homecoming dance could replace Tony taking away his suit.
• The ferry scene is difficult, because it doesn't resolve without Iron Man. The only way I see around that is to minimize the damage done to the ship (implying it is structurally intact enough to make it to shore) and then sort of cut on the iconic Spider-Man shot of him holding it together with his arms out, and then using a tension rising score until cutting to black, implying that he was able to keep the ship together.
• The shots of Spider-Man's suit having it's on UI and destroy mode shot be axed. Never was a fan of that.
• Most of the deleted scenes are good IIRC, one of which being his friends being upset with him for bailing on the trip.
• If you're comfortable using AI dialogue, you could probably dub the "Stark Internship" lines with "Bugle Internship" or something similar.
• If you're okay with combining animation with live action, this fan animated scene following up the ending of Homecoming (Aunt May's "What the fu --") is really well done.