I doubt it. If you take your example, drilling a hole thru any bolt, without a way to keep your hole straight, it will be worse. Plus, the screw needs to be shaped on the action side to either be a "V" or match the radius of the receiver.
Some pillars are basically stainless steel tubing, such as Winchester/Mauser actions. Those are probably 5/16" holes and 3/8" outside diameter. If you did that you would be better off than hand drilling a screw. Your tube based pillar is only going to to contact a pin point on the round receiver however.
So, if you can find heavy wall steel tubing, you can drill holes perpendicular to the tubing to create the mechanical lock Shep was talking about. Even if you spot drill without breaking thru the tube wall (dimple it) that would be better than a smooth tube o.d.
Sounds like getting pillars to your home country is not possible (?).
If your choice of epoxies are limited to what you can get at a hardware store, JB makes an epoxy that is filled with aluminum or steel. But, the set times are fast, so make sure you hand fit pillars and triple check. I would epoxy set pillars in one operation, then come back and sand heavily everywhere but the installed pillars, relieve the plastic stock on the recoil lug mortise about 1/16" on the side where the lug contacts on recoil.
Use Johnson spray wax on action, Screw threads, recoil lug face, taped areas. Look this up on you tube....good luck.
Still, shoot it first. This whole improvement may not be needed....