hI DdlV I du not fully understand your first sentence anyway, I do not understand the distinction between the SR rule for Trader or for trading system.
This is what I do, without thinking too much, I guess...
I test the TS A and the results is that the required capital is 1.000€. i start the TS with 1.000€. The profit of the TS A will be reinvested accordingly with SR rule.

Then I test the TS B and the required capital is 1500€ I start the TS B with 1500€
The profit of the TS B will be reinvested accordingly with SR rule.

I treat the two TS as totally separated, I do not make any other consideration: one TS, one Capital required, one SR rule calculation for each of them.

Easy and simple. Ciao