Is it possible to specify fractional instr number when using named instruments ?

I know the following won't work, it's just to demonstrate the question

in orchestra:

instr Sine
(instr code)
endin

in score:
i ("Sine".1) 0 1
i ("Sine".2) 0 1
or
i ["Sine"+.01] 0 1
i ["Sine"+0.2] 0 1


I sometimes find it handy to explicitly control the fractional instr
number, but I can't figure out how to do this with named instruments.

best
Oeyvind