If you're serious about printing your slides Ilfochrome is really the only way to go. Creating positive prints in the way you describe will yield, as they say, "less than optimal results." The negative image will have very high contrast, and the positive image will more than likely have poor tone and color. If you must RA4 paper, you will need to create internegatives from your slides and then make prints from them.
I suppose I will have to use negative films which isn't a bad thing really.
I just really like slides