Conditional flop for multichannel expansion in Ugen wrapper

Questions
1

hey, i would like to implement a conditional flop for my ugen wrappers, so if you multichannel expand those via a multichannel phase you can still access the different outputs via their key from the dictionary. Would someone know how to do that properly? (the next_a / next_k with internal interpolaton implementations are still on my list so im forcing alot of params currently to be audio rate, i hope i can do better pretty soon).

One example from my UnitUSR Ugen. If you drive that with a multichannel phase you cant access the multichannel outputs via register[\bit3] or register[\bit8]:

UnitUSRUgen : MultiOutUGen {
    *ar { |phase, chance, length, rotate, interp = 0, reset = 0|
		if(phase.rate != 'audio') { phase = K2A.ar(phase) };
		if(chance.rate != 'audio') { chance = K2A.ar(chance) };
		if(length.rate != 'audio') { length = K2A.ar(length) };
		if(rotate.rate != 'audio') { rotate = K2A.ar(rotate) };
        ^this.multiNew('audio', phase, chance, length, rotate, interp, reset);
    }

    init { arg ... theInputs;
        inputs = theInputs;
        ^this.initOutputs(2, rate);
    }

    checkInputs {
        ^this.checkValidInputs;
    }
}

UnitUSR {
	*ar { |phase, chance, length, rotate, interp = 0, reset = 0|
		var register = UnitUSRUgen.ar(phase, chance, length, rotate, interp, reset);
		^(
			bit3: register[0],
			bit8: register[1]
		);
	}
}