Bedroom dilemma inc SN

[VforVienetta]

Wondering how to solve the following;

We moved last winter from a small 2 bed mid terrace, as we have two DC who couldn't share and a tiny garden.
We now have a 3 bed end terrace house with a lovely big garden. V positive move.

DS1 is 7 and has high functioning autism, DS2 is 4 and NT.

We gave DS1 the small single room, under the theory that it would be his private space and he'd never need to share it or give up his bed for guests.
DS2 has the small double with bunk beds in, but often sleeps in with us anyway. His room has a huge ikea storage unit in it with all the DCs clothes.
This also gives DS1 privacy, as DS2 never has a need to go in his room.

The problem;
DS1 is complaining his room is too small, he spends a lot of time in there, and tips everything out every day.
DS2 doesn't play in his room so much.
Some guests can't stay in the bottom bunk as they're elderly and find it uncomfortable, so DS1 has still occasionally had to give his bed up.

What to do?
If we switch their rooms, we'd need to have a massive storage re-jig so that DS1 could still have privacy.
DS1 would still have to give up his bed for GPs, as DS2 doesn't want to give up his bunk bed.
The best solution is that DS2 has the small room and the single bed, but then he's getting the shitty end of the stick, which happens often enough with an autistic sibling.

Aargh. Sorry for the essay. Any thoughts?

Sounds like a plan. It sounds right to me that DS1 keeps the bigger room and some bunks, somehow, as he feels strongly about them.

Surely it is more comfortable for adult guests to stay in an Airbnb nearby for those few nights? Or for them to go into your bed as you say.

Would a bed like this work?

furniture123.co.uk/p/dynamo-white-cabin-bed-dyn001?refsource=FUadwords&refsource=fuadwords&mkwid=s2t6LntzD_dc&pcrid=278394734794&product=DYN001&pgrid=58221464844&ptaid=pla-364409803647&gclid=CjwKCAiA9qHhBRB2EiwA7poaeLwKhbZ_bUY7Q21HX6GA3gmPzxqv1D_BQKDsxAdP9XocUip5dQJsnhoCMrkQAvD_BwE as you could have flexibility in moving the space around underneath.

Unfortunately neither DM or FIL can afford to use a hotel every time, nor can we pay for them.

DS1 needs a low bed, as he has proprioceptive issues that make him unsteady, and he dislikes climbing into/out of bed. He falls out of bed if we don't use his bed bumpers.

I reckon the new plan will work, fingers crossed.

Curveball (and whT we have) is invest in a good sofa bed for downstairs and give guests your room, or else pay for a Premier Inn for them.

PickaChew we have a pretty good one that everyone under 70 finds comfy, as it was our only option at the old house! It's one of those platform ones that pops up rather than a fold out skinny thing.

I would be keeping it as it is. Or alternatively explain to DS1 if he wants the extra room, it comes at reduced privacy due to storage issues- so he will have to accept his brother and you entering the room whenever it is necessary, regardless of what he's doing. He juts sees the size difference, but not necessarily the disadvantages that go along with it. I wouldn't be giving home the larger room, and also making allowances for his privacy- he needs to understand it's an either or scenario- not an all.