To me I would replace the R1 with a normal R1. To declare my bias, my track is smaller but sometimes it takes more than a single lap to pass. Despite contrary statements its perfectly possible for two capable drivers to pass/go side by side on a standard R1. This is not possible on an R1 like yours so may actually hinder passing in reality. In the end its your decision.
Again only a thought, but if you want greater complexity then a crossover track may be better than your R1 as it forces the drivers to change tracks, similar danger to your R! but potentially more gains for the issues it produces. Not my idea but it is one is sometimes use, I am embarrassed to say I can't remember who had the good idea.
I do like the tack as it has a good mixture of curves and mixtures of radii. It will be a fast track as you only have a limited number of R1's.
Best thing is to drive it and see.
It depends what you want but you may find the pit lane a bit short, serviceable, but short. Again its what you want. On my track which is currently 6 ft by 6 ft I have a pit 3 straights long.
Please don't be offended by my comments, they are thoughts only, but I found the input from other folk provoked new ideas of my own and I felt I gained by their comments, if only to confirm that I had what I wanted..