The 4 ohm one can be useful for some users of 50, 100, 200w solid state amps to save hauling another cab. Not what I would ever do though, lousy FOH dispersion from 410 cabs!!
A typical 410 will be a lot louder whether it is 4 ohm or 8 ohm.
You still won't hear it down on the floor on a small stage.
Try elevating the 15 before doing anything.
You need to determine your liability. It isn't hard but takes persistence in wading through web pages to find the bit that describes your residency and entitlement to bring household effects back.
If the strings still sound ok then you may as well give it a proper set up. Otherwise I'd be putting some new strings on and playing the heck out of it with a simple intonation setup. Then go to town on the truss rod if required.
Bass in case or gigbag? It makes a huge difference!
You mentioned a need for a hybrid/ e car. Is that a hard requirement or not?
You implied a requirement for something as small as possible, to contain bass and cab out of sight. I thought that was pretty clear. I don't know why every gig wagon on existence is getting a mention.
A Rav4 is pretty big for a small car!
What's the budget?
There was a guy asking about getting his stuff back from Greece. Another guy had an amp needing repair in EU and sent back. Both cases involved deep diving the customs website....
Users report the fan is on idle speed when not playing and spins faster when playing, louder > faster still. Too loud for some fusspots. Some say theirs spins fast all the time, suspect broken!
That's a very unusual situation to be in. Your best bet would be to consult your H.M.Customs web maze for the rules on you dual residency types. I expect it will be simplified to a require time duration on the most recent occasion abroad and expiry since getting back to Blighty.
If a BF 110 is too big you're going to have to say how small it really has to be.
You could probably get someone to spec you a weird 'flat' cab that would slide under the bed with a 12'' guitar driver to go with your 10w amp.
It has happened a lot with me.
I noticed it happening when I was replying from mid stream. So I went to the end of the thread and it autocompleted my previous response window. Then I had to submit and worked.