until it has a super above.
Not really. A nucleus hive is generally about half the size of a full sized hive, that is all.
5 or 6 frames is normal. A full sized brood full of bees is still a full colony if it doesn't have a super above.
most 11 frames of bees
Not so, if you can get two broods full of bees!
I would split into a brood box with dummy frames to reduce the space or even a tighter fitting divider if temperature is an issue. You will likely need full broods by the end of the season (unless you are going to take nucs through the winter)
By all means go for 4 colonies but you must be prepared to reduce, by uniting, at the season-end if they look to be at all under-strength.
Honey? You would not expect so much if you go for increase.
You need a strong colony to split 4 ways, especially with little experience. It needs to be done early in the season before there is a wasp threat (no guarantee that this weather will reduce the wasp problem next year - it needs a lousy spring to destroy a lot of the potential nests while the queen is working single handed to raise those first workers).
Personally, I would recommend, at this stage, you plan to split in two and hope to pick up a swarm as well. With only one hive to play with, splitting further might be a disaster. If strong enough to split three ways, consider that to be a bonus.
Any late splits might be robbed out by wasps and you have no reserve for strengthening your colonies in that situation.
The alternative is to feed them up, encourage brood (a second brood box) and then perhaps be strong enough to split further. But forget any certain decent honey crop, unless you can grab some OSR early.
Problem here is that you are working with that one colony - no choice of best one to build up - so if it is slow to expand for any reason, you can be thwarted in your aspirations.
On the other hand it might be a super spring and the bees go off like a train, so you can look back at this post and say 'rubbish, it was easy'.
One last thing is you will need to induce queen cells which can be a problem if the colony is not strong enough. Simply splitting and using emergency queen cells is not advisable - scrub queens are not the best way to go. They might do but not to be recommended as the most reliable method.
So what you need to do now is buy enough kit for all the possible eventualities and just 'play it by ear' when the time comes and it is decision time as to what you are confident you can manage.
Just don't try to run before you can walk.
Regards, RAB