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citric acid bath , or oxallic acid bath , will remove all the crud but more importantly the loose rust, both outside and inside the frame without damaging the paint or stickers, dry out the frame well and then treat with a rust converter on the outside and rust inhibiter inside the tubes, Note, i would test the rust converters if you use one with the paint on the frame , sometimes the converters will work as a solvent on paint so be carefull, as to the chemical metal filler , it's actually called that, get it from car shops etc but there are a few on the market , note..... i put "if your not having it powdered" use chemical metal type filler, however if you are thinking of having it powder coated you should consider ..... powder coating involves baking the parts in an oven , so temperature may be an issue with the filler, best to check with the powder coaters as to what they recomend , i would think most would recomend braze or lead filling only? or they may use a particular high temp filler? as always on here, SBD is man to ask tbh any one half decent with a mig welder could sort those holes in about 5 mins then your covered whichever way you go with the paint
