I would like to make a suggestion both as a low budget competitor and as Race Director for the upcoming event.
The rule states R-888 must be used in all competition sessions, meaning qual/race. You can still use them in practice. Use the Ra1 in practice and the r888 in qual/race. This will help you use up what is left of your ra1s as well as SAVE your r888s from being heat cycled in a scoreless practice session.
I always practice and sometimes qualify on old hard junk tires, and will only put on the good minimal heat cycled tires for the race session.
There are many other benefits for doing this. A junk tire in practice will feel the same as a greased up overheated good tire at the end of a race, so doing this you will ultimately know what the car will feel like at the end of the race.
Just my 2 cents!!!
See you at the track,
Will