Since the rules books cited don't adhere to their own rules for more than a page (pu has 'tenpo pi suli mute' on page 45) and they, in fact, say nothing about 'pi' with verbs (nor say that 'pi' is only to be used in the way described), you can, I think safely ignore the prohibitions. On the other hand, the long string of 'pi's is clunky style and it would be nice to get rid of some of them. I don't see how to do it except by serious rearranging the pieces, which is just not my thing. Lope's particular criticism is irrelevant, however, since he doesn't believe that a 'pi' phrase can occur within a 'pi' phrase and so takes the three (nested) 'pi' phrases here as parallel, each applying to 'ni', rather than 'pi pali mute' applying to 'selo insa oko', and all that attached by 'pi' to
the 'lon' of 'lon lon' (not too pretty itself), all of which is finally attached to 'ni' (Lope doesn't believe 'pi' can be used to attach PPs either). All I can suggest is going back to the simple sentences and seeing if there is another way to put them together into this idea complex.