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That's how I got back into it. (Some RR and TT's as a kid)
Pop some extensions on your road bike and get stuck in. Piece of cake. You migh suprise yourself.
I started off doing mid 24's on the road bike for a season, got myself a cheap TT bike and trained as much as my free time would allow. Bagged my first 21 last season so I'm happy given the hours I'm prepared to give.
Just try it. Nothing to loose and only yourself to beat.
Not too personal ;-)
I weigh about 82kg. That FTP is a little high as its a virtual estimate based on my turbo resistance. Not spot on but consistent enough for me for things to be repeatable.