need a new shower but my hot/cold pipes are reversed! plumbing advice

need a new shower but my hot/cold pipes are reversed! Hi All
I need some advice as to a replacement power shower and there are a few problems
I have posted a photo showing the old unit ( a ShowerForce 2000 ); it has supply pipes which run down from the roof and into the left side of the unit as shown

The big problem is that the hot and cold are reversed ie the hot is on the right and cold on the left
I have heard that it is possible to get a reversed cartridge? that can be fitted to a shower unit to allow for this

So can someone tell me if there is a make of UK power shower that
a/ allows for supply into the left side and
b/ can be modified to allow for the reversed hot/cold pipes?

I want to avoid the hassle of having to get the pipes plumbed the correct way round and would like to minimise any damage to the tiled wall by using the existing pipework

Any advice would be very welcome
thanks

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