Creating a "synthetic" price pair with a basket of Fx pairs

Phase 1

Need to create an indicator that will draw the fluctuation of multiple FX Pairs, if they were bought at a precise point in time.

It is a synthetic Fx Pair trend / chart that I want to see. Some kind of an index of multiple Fx pairs.

Need the ability to choose the date from.

Be able to use regular / popular indicators on the chart

Be able to Short/Sell, or Buy/Long

Be able to chose the trade size: 0,01, 0,02, and so on...

Let's say between 2 and 12 fx pairs. Once build, the number is futile, simple add on in program

Because we cannot use price averages and accumulated pips to calculate a ''price number", due to prices difference and pips value, $$ will be used as a reference.

I want to be able to fix a date backward, to start at a 0$ point / date and see how (example) a buy of EUR/USD and a sell of GBP/USD evolved since the starting date at a X size lots... I want to see a usable chart of this basket, evolve in one round number, like an Fx pair price (candlestick / diffrent time frame)

This will require a custom graphic... Is an regular Fx Pair chart will be needed as an anchor?

That CANT be an EA, because EA will open at the beginning and close at the end without seeing the capital fluctuation. It will show a Profit / Loss results only.

... Or both EA and Indicator? You're the Pro.

This some kind of arbitrage indicator

No openning and closing trades needed for the moment. All trade will be done manually after analysing movement of the Fx basket chart.

Phase 2, (possible)

Make an EA that will trade such a basket that will be selected after analysis.