Hi @nathanpovo. Not sure where you’re located, but there’s usually a pretty active secondhand market in the US for v1 sensors on Reverb. Here’s a listing for a single v1 sensor I found.
TRS –> XLR adapters will allow the v2 sensors to physically connect to the XLR inputs on the Portal, but they will not be receiving the correct amount of power from the Portal (around 5x the amount they require). This negatively affects the sensor’s performance and could potentially even damage them. We are working on a fool-proof solution for more inputs, but for now you can always add additional analog or MIDI inputs alongside your sensors. If you give me some more info about your existing setup (acoustic vs. electronic, MIDI vs. audio, etc.), I could give you some suggestions to try.