"having been supported" is correct and usable in written English.
You can use it to indicate that something has been done in the past, usually as a result of help or assistance from someone else. For example: "The project was a success, having been supported by generous donations."
Companies that Failed in 2017—Where Are They Now? TransAlta received 89.01% support for say-on-pay at its 2018 annual general meeting, having been supported by both ISS and Glass Lewis, a reversal from the previous year when both proxy advisors recommended that shareholders vote against.
Pierre-Paul, Baron Riquet de Bonrepos, together with his engineer, François Andreossy, finally overcame the main design problem of providing a sufficient water supply system for the summit with plans for building a dam. Louis XIV granted permission for the construction of the canal in 1666, Riquet's case having been supported by the finance minister, Jean-Baptiste Colbert. Jean-Baptiste Colbert
This update brings the Hulu's Android stable up to 10 devices, with the Nexus One, Nexus S, HTC Inspire 4G, Motorola Droid II, Motorola Droid X, and the Motorola Atrix having been supported from the get go.
That's ancient history, and Wilson now is riding the crest of an impressive reelection victory, having been supported last November by 91% of Republicans who easily preferred him to Democrat Kathleen Brown.
I have to say that I did miss Kasim Abid's film Whispers of the City in Abu Dhabi, where the film played in the festival in 2013 after having been supported in post-production by SANAD, the funding arm of ADFF.
Mixed support items were construed as having been supported if the majority of remaining votes were 'unsure' rather than 'do not include'.
