The bars are wider than your T slots ? If so , use slot blocks in a rear slot , use parallels to locate your part over next slot and use a clamp . You can drill and tap your thru holes without drilling your table or using a sacrificial plate .
I have done this but care must be taken when drilling very many holes this way as any error in the spacing is compounded and even a tiny error will add up to an unacceptable amount if you have to drill many holes this way.
I hear you on the future uses but, it rarely works out for me. If I know I’m making the same thing over and over again it’s certainly worth a permanent fixture. A quick one use alignment jig and onto the burn pile saves so much storage space in the shop! Not to mention, making simple setups is good practice for when you do want to machine a keeper.
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