POR 162 says that the assessability of foreign income earned before 31/12/2023 shall not be enforced.
I agree with your assessment of things. Cash in a personal bank account falls easily under the rule, everything that is not cash in your account is an asset of some description. Whilst it may be possible in some cases to accurately value an asset as of the end of the year, the following day that asset becomes comingled funds that include income earned in two periods, one exempt and one assessable. Whether or not it is both possible and permissible to separate those funds, using the year end valuation or FIFO, is very unclear but I strongly suspect it is not.....opinion only.
POR 162 only relates to funds that are in cash and in a personal bank account. Everything else is an asset of some type and despite being able, in some cases, to value that asset as of the end of 2023, the funds are not fully liquid and fully available.