Instrument procedures under VMC - question.

If it's in controlled airspace, and as long as ATC agrees, what could prevent it ?
On the other hand, in uncontrolled airspace, Standard integration rules applies, that means : recognize runway in service by flying over the circuit, and start at the beginning of the downwind leg.....

Just ask ATC for a "simulated VOR/ILS/RNP approach".
Maintain VMC and follow the IFR-procedures.

As Fabrice said, in controlled airspace agreement with ATC is mandatory. The best way we practice with PPL students (EASA exercises 18c - Radio navigation) is to request: "Simulated arrival...", "Simulated ILS, VOR, NDB, RNP Approach RWY...". If ATC has resources then is it possible otherwise no. Attention: Student is flying by instruments and FI with the best look out of the cabin!
Uncontrolled airspace is something different. There is your additional responsibility for traffic separation, which could sometimes be unpredictable. Risk mitigation shall be applied very carefully.
In any case, for solo flight, we don't approve VFR pilots to fly IFR procedures. There is BIR and IR training and licensing available for such enthusiasts.

the procedures you mention are controlled procedure.
As long as you receive permission to follow them under VFR rules (and that is at controller discretion) you can legally do it ,even without any proper certfied avionic . If you do not have any trasponder ,at least mode C, they will never give you permission,because they cannot trace you. As you are in VFR they can cancel the permission at any time ,without justifing it, and ask you to go away

Yes you may do that. You need a clearance when in controlled airspace.

A number of points to observe, if you use the option to fly IFR procedures in controlled airspace, while VFR:

Make sure that you understand the procedure! ATC expects you to follow it, if that is what you have been cleared to.

Also maintain a good lookout! When flying VFR you are responsible for separation from other aircraft in both class C and D airspace.
This usually means that flying an IFR procedure VFR for IFR training purposes does not really make sense unless you have a qualified observer/instructor in the other seat.

On the other hand, in some instances, e.g. when making a night VFR approach to an IFR airport, it could be very useful to follow an IFR procedure, as it will provide terrain clearence as well as help navigating both horisontally and vertically to the runway, and at the same time ATC will be happy to know exactly the route you are following to landing.

As an IFR instructor I sometimes accept a VFR clearence to an IFR procedure when training an IFR student, when an IFR clearence is not available due to ATC being too busy or unable to provide IFR separation.

Dear friends,
thank you very much for your comments and opinions. I am very grateful to our community for quick response. Some answers are more detailed due to local differences of course.
For example, I don't expect to fly somebody to controlled airspace without Mode 3A/C transponder at least here in Slovakia. If yes, it will be very rare and special flight, probably some sort of historical vehicle flying with proper support. But this type of aircraft will definitely not use IFR procedures for any reason.
My question was about knowledge of any legal obstruction to perform flight according to published IFR procedures (STAR, SID, instrument approach) wit full respect of VFR (responsibility, separations etc.) and only in VMC obviously with suitable equipped aircraft capable to maintain required navigation performance.
Regarding the ATC, it looks that in this case very well known and expected flight trajectory could be an advance and simplification of situation awareness as you are not subject of separation and position is easy to be predicted.
Once more, thank you friends