tri wave from phasor is possible the same way than the others, (i cant tell you offhand now, but i think tri was the one where you also have to care for the phase(!).)
(eventually you will have to raise the number of partials from 8 to 12 or 16 to get the same spectral content as for sawtooth, not sure.)
and the most basic hard sync is indeed simple, you would just restart the phase accumulator early.
and of course you are right, when you run bl waveforms which you did by additive, you also wasnt to use bl sync.
regarding the use of blep/blit like phase accumulator modulations i kinda have the same request like you, so i keep watching, though it is doubtful anyone can answer how to do it on pd patch layer - efficiently and easy to use, that is,