You have to face the cold hard facts abut Scottish Junior Bridge:
1) Lovely as you all are, none of you are elite players and there are going to be some teams that beat up on you no matter how well you play. What you need to focus on in the short term is moving from the bottom of the field to the middle third. This whole exercise has to be viewed as a long term project over 2-3 years that will benefit Scotland - even if it means you have to sacrifice your favourite convention in the process.
2) Scotland has only a small pool of players and people are going to come and go from it from year to year. It is extremely unlikely you will be playing with the same partner in 3 years time that you are now. Even Harold and I played with different partners in our 10 years in the junior team. No matter what you think, you cannot develop or pick up a new system in a few months that will survive the rigours of a 300 board international tournament. Especially the amount of practice the typical Scottish junior puts in. If some of you think so, then I fear you are in for a reality check when you head for Italy next month.

3) However you want to look at it, you are representing your country in a team event. This is not a pairs tournamant. In football, players don't run around the pitch making up their own tactics and doing their own thing... this may be Scotland but Catherine is not Berti Vogts!

A good squad will agree on an approach, learn it well and then stick to it so that if someone has to be brought into the team at the last moment, the team doesn't suffer as a result.
4) You are unlikely to agree amongst you on a system and therefore the basics (NT, 4/5c M, etc) should come 'from above' and then intricacies agreed through a series of workshops/training sessions. In my opinion, if you don't like the system you are told to play for the national team then you should either accept it for the good of the team (I hated 2/1 to start with but I was told to play it and so did) or go and play for someone else.
Myles' comment about the Durham 'A' system is interesting. If you are teaching beginners you need a basic system to start them off, but obviously this isn't going to be enough for more advanced players. Why don't the good players at Durham play an advanced version of the basic system rather than ignoring it to play their own thing? What hope do the beginners have of ever aspiring to play with the more advanced players?
There is no reason why you can't have two Scottish system files:
Scottish System v1 for the U25s and
Scottish System 'Lite' v1 for the U20 squad which Joan could teach
I'm now off to trademark those names...
I'd' be interested to hear people's counter arguments against the above points. It would certainly be more constructive than debating the meaning of (1x)-P-(1NT)-X.