Converting Kvass recipe to Partial-Mash

Going to give East End Brewing's Kvass recipe (from BYO mag) a shot. My last few batches have been partial mashes which have gone quite well. Trying to convert this recipe to PM and could use a little help since the grain bill is so small.

Orig recipe:
5.5lbs Pilsner malt
1.0 rye malt
.5 brown malt

My conversion so far is:
3lb Pilsner DME
1lb Pilsner malt
1.0 rye
.5 brown

Is this enough Pils to convert the rye? Or should I add another lb of Pilsner and adjust the DME accordingly. Shooting for 1.036-1.4 OG.

isnt kvass supposed to have actual breads in it? besides that, that recipe just looks like a very light hybrid beer

Ah, yes I just left that part out. I will also be adding 1 1/2 loaves of homemade rye bread, soaked in near boiling water for a few hours, then pureed. Also 2oz of caraway seeds and fermenting with dry bread yeast.