kerias shema and kavanah (II)

Apologies for not finishing this topic sooner (or very coherently) - swamped with too much other stuff on my plate right now! Continuing from last post...
Unlike the Ramban (Milchamos R"H ch 3) who understood the sugya's debate over kavanah in kerias shema as the same as the general debate over whether mitzvos tzerichos kavanah, R' Soloveitchik explained (as David also commented on the previous post) that the Rambam held that kerias shema requires a unique higher level of kavanah by virtue of its being a fulfillment of kabbalas ol malchus shamayim. This is why although the braysa quotes a number of opinions as to the shiur of kavanah for kerias shema - the first pasuk, the first perek, etc. - the gemara never relates these opinions to the general debate of mitzvos tzerichos kavanah. Acceptance of Hashem as King (kabbalas ol) by definition is a mental act which requires intent; the debate over mitzvos tzerichos kavanah is whether a physical act of mitzvah performance requires accompanying intent to define it as a mitzvah. The Rambam understood the case of korei l'hagiha not as mitaskek (Rashi) or as improperly pronouncing the words (Tosfos), but as simply reading without this higher level of intent for kabbalas ol, which is sufficient outside the requirements that apply to the first pasuk.
R' Soloveitchik used this same idea to explain the Rambam's opinion regarding someone who falls asleep in the middle of kerias shema. The gemara writes that R' Yehudah instructed that if he dozes off, he should be woken up to recite the first pasuk of shema with kavanah. According to many rishonim, he would recite the rest of kerias shema, but he was not concerned with the intensity of kavanah for the remainder. However, the Rambam writes that one must be woken to read the first pasuk, and then if one dozes, one is not obligated to recite the remainder of k"s at all. According the the simple reading of the Rambam (in perek 1), all three parshiyos of k"s are d'oraysa, so why must one be woken only to read the first pasuk? The Rav explained that if one falls asleep one is patur from mitzvos becuase of ones, and this ptur is relevant even for the mitzvah of k"s. However, there is a specific din in kabbalas ol malchus shamayim which supercedes the exemption of ones and requires being woken to recite the first pasuk.