There are plenty of european maltsers that make low colour Pale malt. Low colour Maris Otter is around 2L, Golden Promise is around 2-2.5L, Extra Pale Ale from Simpsons is around 1.8-2L, and on top of these and much more, you have the Pilsner and Lager type malts ( which are around 1.5L ), which are really low coloured. And they are made by german, dutch, belgian, scandinavian, polish and english maltsters.
For 5 gallons/20 L of this recipe, you need like 3.5 Kg / 7.7 lbs of grains and if you are using Halcyon, Pilsner, Pearl, Lager malt, etc. you literally have a beer which is far under 4 SRM and close to 3 SRM, so I don't really understand how you cannot achieve the desired colour with the awesome malt variety available in Europe.