Might be possible with really long needle screws that come out the end of the fuel bowl (with a low-mounted IFR anyway). Think there would be clearance problems with the float, and you'd have to seal them to the bowl too...
Since I see people putting the IFR jets in the top of the metering block runner it might not be that complicated.
It would depend on if there is a straight shot from the top of the block into that same port.
I just don't feel like pulling it all apart again at the moment to investigate it.:D
Might see if one of the local guys has a metering block I can study.