Chamfer with size related to another edge

Hi,

I have two square tubes that need to be welded together with an angle of 90° and with each of them cutted at 45° (as in the picture, hoping it is clear enough):

and in order to do a proper and completely filling welding, I need to prepare the edges with a chamfer on the ends of both tubes (like a V-Butt weld indeed).

If I just make a chamfer feature on the edge, being it with a constant size, the chamfer doesn't remove material in the same way through the whole edge loop (leaves some flat surfaces, and the reason is related to the geometry).

I am searching for a way to have the white square end of the chamfer being tied everywhere to the inside edge, which would be perfect for my purpose.

I have tried many ways: selecting reference instead of value, by performing a sweep with the two chains and changing the options (normal to trajectory, to surface, etc etc...), but with no success.

Maybe with the sweep is feasible (and I may be missing something). I would like to avoid the edge prep feature of the welding (admitted it can do this), since it has created problems in the past and I also need to have the feature present and editable in the tubes .prt for manufacturing reasons.

Also, I could find a workaround but as far as I am able to, it has too many features and gets heavy in assemblies.

Has someone already achieved this or knows how could I do?

Many thanks,

Bye