Amplifier To Boost Transverter Output Level

A mini-circuits GVA-63+ perhaps? I'm not sure how much DIY you are willing to tackle here...

On e-bay 1-512MHz RF Power Amplifier 1.6W HF FM VHF UHF F/ FM Amateur Radio Walkie Talkie

I use 2 of these in my Home brew Transverter / Amplifier controller. You can see it on my QRZ page. They are reliable and will drive my 2 m amp to 40 watts for FM use. I know that you are not a home builder, but for two meters should be ok, but you would need a t/r switch or use separate antennas for RX/TX on 2 m. Separate antennas would avoid any need for the switch. You would use XVTR out for TX, and RX in for input signals.

Please be aware that I tried at least 3 different amps (different designs) two failed after a period of time. Also make sure to put a reverse bias diode on power input of the amp. Reverse. Current from a relay can destroy these amps. I have 3 of the current design and work reliably. Forgot to add this to previous post.