Shea returned to Alcatrazz in January 2020 to replace Heavenstone. Bonnet's post-Alcatrazz projects have all been short-lived and included Blackthorne (working with ex-Balance guitarist Bob Kulick, brother of Kiss guitarist Bruce Kulick), backing vocals for the Danish heavy metal band Pretty Maids' "Future World" and numerous session work for Forcefield, appearing on "To Oz and Back" and "Let The Wild Run Free". In 1988, Bonnet joined Impellitteri, for their album "Stand in Line". An appearance on Eddie Hardin and Pete York's musical adaptation of "Wind in The Willows", performed live in Germany in 1991, saw Bonnet sing on around six of the songs alongside fellow musicians Jon Lord, Don Airey and Ray Fenwick amongst others. Fenwick and Airey also featured heavily on Bonnet's 1991 solo album "Here Comes The Night" which includes several covers as well as songs credited to his then wife Jo Eime, and another remake of the Marbles' "Only One Woman". In 1997, he released "Underground", a new solo album, which helped re-establish him with his fan base in Japan. 1999's "The Day I Went Mad" featured guitarist Slash, Def Leppard guitarist Vivian Campbell, Bruce Kulick plus guitarist, Mario Parga. Bonnet contributed lead vocals to the Japanese heavy metal band Anthem's 2000 release "Heavy Metal Anthem", which had reworks of classic Anthem tracks. Bonnet rejoined Impellitteri in 2000 for their "System X" album. Meanwhile, his 1999 Japanese solo album got a UK release in September 2001. At the back end of 2001, Bonnet went on a solo UK tour. His band included keyboard player Don Airey, bassist Chris Childs and drummer Harry James of Thunder and guitarist Dario Mollo. In early 2004, Bonnet joined Italian guitarist Dario Mollo's new project Elektric Zoo, touring Europe during April. Maintaining the Italian connection, the singer also participated in Matteo Filippini's project, Moonstone, featuring on the track "Not Dead Yet". In 2006, Bonnet contributed vocals to the "Welcome to America" album by Taz Taylor Band. The band toured the UK in 2007 and Europe in 2008. He also appeared in the "Countdown Spectacular" concert series in Australia between August and September 2007. He sang two songs, "Warm Ride" and "It's All Over Now, Baby Blue".