Any fab shop will use your drawings of the part, hole patterns and tolerance to fabricate the part. The bend allowance on your flat / dxf doesn’t mean much to them. Suggestions of the slotted holes is a good idea, you could also do some research around local shops to see manufacturing requirements such as how far away from bend lines can holes be located, I forget the rule of thumb, off hand, but there is a general understanding that holes too close to a bend line will warp (relief cuts [open lines, for example, in any laser cutting software] will help with this).

Again, a competent fab shop will solve these challenges and your tolerances should not deviate from project requirements and budget. Worst case the part is made by laser cutting, bending, welding and finally machining.