Things which might be added to other voting systems.
Party ranking. Not all voters will wish to give explicit preference to 30 candidates. Many would prefer to rank 6 parties instead, leaving it to each party to rank its candidates. So perhaps allow the voter to first rank individuals, if they wish, and then to rank parties. Requires no change to the evaluation rules, but does require a small change to the procedure, though not one which makes a manual count infeasible.
Equal preferences. Why in ranked choice voting should not two or more candidates be given equal preferences? Realistic, and convenient for the voter. Requires a small change to the evaluation rules, but unfortunately one which makes a manual count effecively impossible.
NOTA. Vote for “None Of The Above”. Ranked like any other choice. Might have enough support to win a seat. Could be just advisory: just note the voters’ feelings and go on to their next choices, if any. But possibly binding, in which case the count terminates, and the election is rerun, with all unelected candidates barred from standing.
Non-geographic constituencies. <proportionality other than party proportionality> <e.g. ethnicity, religion, but possibly also age, sex, and even RSPB membership> <but see also HoL reform>