I think you've been very lucky to have been granted entry to the UK so many times, especially if you've been honest about the fact that you've been living there on a visitor visa.
Just because you've been privileged enough to not have any problems before doesn't mean you should push your luck now.
As KFdancer said, it's good that you've noticed the problems before it's too late to get back on the right track.
I'd put everything on the back burner now and get your status sorted. You need to be legal. Everything else (dress, fitting, blessing ceremony, etc) can wait.
If you do try to re-enter, you'll delay your visa process and might cause more problems that would have to be addressed (and scrutinized) with each new application.
As others have mentioned, you've been told not to return without the correct visa. That will be noted in their system. If you try to enter without the correct visa, they'll know.
If you're planning to move to the UK, your status will need to be sorted out. It will suck now, but it needs to be prioritised over your dress and wedding.
Hopefully your visa will be granted swiftly and you can carry on with your plans for your blessing ceremony, but for an international move, the visa is one of the most important bits to get right. Not doing so could jeopardize your plans.
Get your visa. Don't try to skirt the rules. Don't push your luck. Play by UKVI's rules. Once you're on the other side of this, it will be worth it.
We've all been there to some degree and we'll tell you that following the rules and not pushing your luck is the best way forward.