I had a similar problem, but with dogs rather than children.
I searched rear seat dog hammock and there's lots available.
they have adjustable click-together loops which are secured around the rear headrests, and again, the same type of adjustable loops which drop over the front headrests.
the ones I bought have zip up side pieces to protect the door cards and even have storage pockets.
to use for children, just let the front face of the hammock drop over the rear seat front.
mine are rubber backed and quilted stitched top side.
for the seat belt / Isofix couplings a simply but carefully made small slits where they're located with a very sharp knife.
Invariably, they are universal fittings but specify large SUV / Range Rover and you'll get plenty of choice, all around UK £25 - £35 EACH and are washable
A very simple and cost effective fix
cheers, and good luck
Mike '17 RANGE ROVER L405 SDV8 AB LOIRE BLUE with INDUS SILVER ROOF
'14 RANGE ROVER L405 VSE 3.0TDV6 SANTORINI / INDUS (gone)
'17 LAND ROVER DISCO SPORT HSE DYNAMIC LUX, BLACK PACK (Wifey's)
'16 RANGE ROVER EVOQUE 2.0 AB, FIRENZE RED (Daughter's)
'17 DISCOVERY 5 HSE LUX, MONTELCINO RED (gone)
'16 DISCOVERY 4 LANDMARK SANTORINI (gone)
'10 L322 5.0 SC AB STORNOWAY GREY / ALMOND (very relunctantly gone)
'04 4.4 V8 VOGUE EPSOM GREEN / CREAM (reluctantly gone)
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