You talk about a complete course in the MPPU but that may not be necessary. A single introductory book (eg. Yinshun's Way to Buddhahood, Shengyan's Orthodox Chinese Buddhism, Gampopa's Jewel Ornament of Liberation) should suffice to provide enough basis for approaching more complicated teachings. But so far Buddhist communities rarely provide the necessary fundamentals, like in the form of Sunday schools. However, this is a discussion rather for the Western Buddhism part than sutra analysis.
What could be looked into here is catmoon's question about what to do with teachings one can't put anywhere. That's one thing. Another thing is the nature of reactions and what difference it makes if this text is from a sutra, from a Zen teacher, from a tantra or somewhere else. Many have read the Vimalakirti sutra and the relevant part hasn't been raised as far as I can recall as a controviersial teaching here or on other forums (where I've been). Calling it a teaching for beginner bodhisattvas might have added to the edge of it. But then, no problems with Zen teachings about directly getting at buddha-mind. How strange!
"If the Buddha-Nature is seen, there will be no seeing of a nature in any thing."
(Nirvana Sutra, T12n374p521b3; tr Yamamoto)
"Neither cultivation nor seated meditation — this is the pure Chan of Tathagata."
(Mazu Daoyi, X1321p3b23; tr. Jinhua Jia)
“Don’t rashly seek the true Buddha;
True Buddha can’t be found.
Does marvelous nature and spirit
Need tempering or refinement?
Mind is this mind carefree;
This face, the face at birth."
(Nanyue Mingzan: Enjoying the Way, tr. Jeff Shore; T2076p461b24-26)