That's a backroute. >_> I thought of another backroute too, time to fix 'em both...
EDIT: Okay, here's a version that should fix both your backroute and my one.
I'd have to say, if you thought that the solution you found was "late-Taxing", then maybe I really did underestimate this level... though I still wouldn't say it's harder than Mayhem at most.
As for the bomber thing... there's really no reason to it at all. I guess in some cases, it's just to catch people who aren't paying attention and don't realise the level requires 100%, in other cases there's no reason other than "it makes the level look like it has more skills than it really does". And then of course there's...
Fierce 1, which despite requiring 100%, cannot be solved without using a bomber.
But that's a very unique case. But that level is actually the reason why a lot of LPIII 100% levels have bombers, too - so that when the player gets to this level, they might think "oh, just another decoy bomber".
(I guess there's also "any 100%-required level that uses the non-fatal bombers" gimmick, but that's a bit different...)
EDIT: Found yet another backroute, uploaded yet another fixed version. No one downloaded V2 so I guess not much is lost...
EDIT: And already found a backroute in this version too... this solution looks pretty tricky to enforce...
EDIT: Think I've got it. The only change needed from V3 to fix the backroute was actually very small. So, here's V4. Fingers crossed...
EDIT: Seems solid now. Any potential backroute I can think of doesn't work out in practice.
Just for reference, the execution for this shouldn't be very fiddly. It's definitely not one of those levels where you have to keep trying adjusting moves by one or two pixels until everything lines up perfectly; it's one of the ones where once you know what to do, you shouldn't have much (if any) trouble pulling it off.